JPH10178310A - Antenna supporting angle varying mechanism and bar antenna system for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To variably set the supporting angle of a bar antenna in a prescribed bearing by providing a mechanism variably operating the supporting angle of a bar antenna for a vehicle. SOLUTION: An antenna supporting angle varying mechanism 20 is provided with an antenna supporting angle varying member 24 bearing the respectively one tip parts of first and second combining elements 21 and 22 by a bearing part 23 and a protection cover 30 consisting of an elastic member covering the outer peripheral of this member 24. In this case, in the state of loosening a fixing nut 28, a screw bar 25 presents the state of being freely screwed or removed with respect to the screw hole 16 of an antenna fixing base 11. Consequently, the removing operation of the member 24 with respect to the base 11 is made free. At the time of fastening the nut 28 when the member 24 comes into the state of facing some bearing, the member 24, namely the bar antenna 12, comes into the state of being capable of variably setting a supporting angle at a prescribed bearing angle.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanism for varying (including undulating) a supporting angle of a rod antenna for a vehicle mounted on a roof of an automobile or the like, and a rod antenna apparatus for a vehicle using the mechanism.

[0002]

2. Description of the Related Art Generally, a rod antenna device for a vehicle mounted on a roof of an automobile or the like has an antenna mounting base provided with a feeder for connecting a feeder to a body wall, that is, the roof of the automobile. , And the base end of the rod-shaped antenna is detachably attached to the antenna attachment base using a screwing means or the like.

[0003]

In the above-described conventional rod antenna device for a vehicle, the antenna mounting base is fixed at a specific angle with respect to the vehicle body wall, and the element length is, for example, 150 mm to 400 mm. The base end of the rod-like antenna is fixed at a specific angle. For this reason, when these rod-shaped antennas come into contact with surrounding obstacles at the time of car washing or garage entry, if the rod-shaped antenna is subjected to a large external force exceeding its elastic limit, the rod-shaped antenna may be bent or broken. There is.

In a rod-shaped antenna having an element length of about 150 mm, the possibility of contact with an obstacle is relatively low because the element length is short. For this reason, even if the garage is put into the garage while the rod-shaped antenna is mounted on the vehicle body wall, there is not much trouble. However, since the element length is short, the receiving characteristic is relatively poor. A rod-shaped antenna having an element length of about 400 mm in order to maintain good reception characteristics of the antenna has good reception characteristics, but since the element length is long, there is a high possibility of contact with an obstacle. Therefore, when the garage is put into the garage, the rod-shaped antenna is detached each time, but there is a problem that the operation is very troublesome.

In order to solve such a problem, a rod-shaped antenna having a variable antenna support angle is interposed in advance at the base end of the rod-shaped antenna, and the antenna is folded down as required, so that the rod-shaped antenna is 2. Description of the Related Art A rod antenna device for a vehicle devised so as not to apply a large external force is conventionally known.

However, the vehicular rod antenna device having the variable support angle configured as described above is generally more expensive than the fixed support angle type. Therefore, not only when such an antenna is newly attached to the vehicle, but also when replacing the actually used fixed-angle antenna device with the above-mentioned variable-support-angle rod antenna device for a vehicle, there is an economic burden. large.

An object of the present invention is to provide an antenna supporting angle variable mechanism capable of transforming an existing supporting angle fixed type vehicle rod antenna apparatus into a variable supporting angle type vehicle rod antenna apparatus, and this mechanism. To provide a rod antenna device for a vehicle.

[0008]

In order to solve the above problems and achieve the object, the present invention uses the following means. (1) The variable antenna support angle mechanism of the present invention can be removably inserted between an antenna mounting base mounted on a vehicle body wall and a rod-shaped antenna whose base end is fixedly screwed to the base. A pair of coupling elements that are rotatably supported at one end, and the other end of the first coupling element is connected to the antenna mounting base or the antenna mounting base. It is a screw rod that can be detachably screwed to one of the rod-shaped antennas, and the other end of the second coupling element is detachably attached to the other of the antenna mounting base or the rod-shaped antenna. An antenna supporting angle variable member that is a screw hole that can be freely screwed, and a fixing nut that fixes a screwed state of the screw rod to either the antenna mounting base or the rod-shaped antenna, Said The support angle of Jo antenna, which is assumed to form a variable can be set in a predetermined orientation. (2) The antenna supporting angle variable mechanism according to the present invention is characterized in that (1)
In the antenna support angle variable mechanism according to the, to allow a support angle variable setting operation of the antenna support angle variable member,
It is characterized in that a protection cover made of an elastic member is provided over the outer periphery of the antenna supporting angle variable member. (3) A rod antenna device for a vehicle according to the present invention includes: an antenna mounting base to be mounted on a vehicle body wall; a rod antenna having a base end detachably screwed to the antenna mounting base; And a variable antenna support angle mechanism that is removably inserted between the antenna mounting base and the antenna mounting base. The variable antenna support angle mechanism includes a pair of shafts that are rotatably supported at one ends thereof. And the other end of the first coupling element is a screw rod that can be removably screwed to one of the antenna mounting base and the rod-shaped antenna. An antenna supporting angle variable member having a screw hole detachably screwable to the other of the antenna mounting base and the rod-shaped antenna at the other end of the coupling element; Or it is characterized and fixing nut for fixing the screwed state of the screw rod for one of the rod-shaped antenna, in that it consists of.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION

(First Embodiment) FIG. 1 is a view showing the configuration of a rod antenna device for a vehicle according to a first embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a vehicle body wall (for example, a roof of an automobile), and reference numeral 2 denotes an antenna mounting hole provided in the vehicle body wall 1. Also one
Numeral 0 indicates an antenna body, and an antenna mounting base 1
1 and a rod-shaped antenna 12. A variable antenna support angle mechanism 20 described below is interposed between the antenna mounting base 11 and the rod-shaped antenna 12.

An antenna mounting base 11 is mounted in the antenna mounting hole 2. This antenna mounting base 11
Is mainly composed of a case integrally formed of, for example, a hard synthetic resin so as to have a hollow conical shape having an inclined bottom surface. A power supply unit 11a is built in this case. The ground side of the power supply portion 11a is connected to a conductive cylindrical portion 11d (see FIG. 2) protruding outside from the inclined bottom surface portion. This conductive cylindrical portion 11d
When the antenna mounting base 11 is mounted on the vehicle body wall 1, the antenna mounting hole 11 is insulated through the antenna mounting hole 2 and is introduced into the vehicle body. The conductive cylindrical portion 11d introduced inside the vehicle body
A threaded portion is formed on the outer circumference of the, and a fixing nut 11b is screwed into the threaded portion. A plurality of projections are formed around the fixing nut 11b, and these projections are used when the fixing nut 11b is tightened.
It comes into pressure contact with the back of the body. Thus, by tightening the fixing nut 11b, the antenna mounting base 11 is fixed to the vehicle body wall 1, and the ground side of the power supply portion 11a is grounded.

The hot side of the power supply section 11a is connected to a feeder 11c that penetrates through the hollow portion of the conductive cylindrical section 11d insulated. The rod-shaped antenna 12 can be detachably attached to the top of the antenna attachment base 11 via a variable antenna support angle mechanism 20 described later or directly. The base end portion of the rod-shaped antenna 12 is a large diameter portion 12a, and the distal end portion is a small diameter portion 12b. The large-diameter portion 12a covers the outer periphery of an antenna element (not shown) with a synthetic resin or the like having relatively high flexibility. Therefore, as shown by the two-dot chain lines M and N in the figure, it is possible to largely bend around the large diameter portion 12a.

The rod-shaped antenna 12 has its base end directly connected to the top of the antenna mounting base 11 without the intervention of the variable antenna support angle mechanism 20, and a plane H substantially parallel to the vehicle body wall 1. It is designed and manufactured so that it can exhibit a required antenna function by being supported at an inclination angle θ of about 50 °.

The variable antenna support angle mechanism 20 is provided between the top of the antenna mounting base 11 and the base end of the rod-shaped antenna 12 so that it can be inserted as needed. That is, when inserting the variable antenna support angle mechanism 20 between the antenna mounting base 11 and the rod-shaped antenna 12, the rod-shaped antenna 1 is inserted from the top of the antenna mounting base 11.
2 is removed, one end of the variable antenna support angle mechanism 20 is screwed and fixed to the top of the antenna mounting base 11, and the base end of the rod-shaped antenna 12 is screwed and fixed to the other end of the variable antenna support angle mechanism 20. By doing so, the variable antenna support angle mechanism 20 is inserted as shown in the figure, and if necessary, the portion of the variable antenna support angle mechanism 20 is bent by hand, as shown by the two-dot chain line in the figure. The rod-shaped antenna 12 ′ can fall down to an angle of a plane H substantially parallel to the vehicle body wall 1.

FIG. 2 is a diagram showing a specific configuration of the antenna supporting angle variable mechanism 20. As shown in FIG. As shown in FIG. 2, the variable antenna support angle mechanism 20 includes an antenna support angle variable member 24 in which each end of the first and second coupling elements 21 and 22 is supported by a support 23, and the antenna support angle. The protection member 30 includes an elastic member that covers the outer periphery of the variable member 24.

FIG. 3 is a diagram showing the structure of the antenna supporting angle variable member 24 more specifically. As shown in the figure, the first coupling element 21 has opposing walls X and Y bent in a substantially U-shape made of a metal material, and a connecting wall that connects between one ends of the opposing walls X and Y. And a coupling portion 21a made of Z. A screw rod 25 is integrally provided on the bottom surface of the connecting portion 21a.

Further, the second coupling element 22 is formed by thickly crushing one end of the metal tube material into a thick plate-like coupling portion 2.
2a. A screw hole 26 is provided in the pipe portion 22b connected to the connecting portion 22a. The connecting portion 22a is sandwiched between opposing walls X and Y of the connecting portion 21a, and a shaft screw 27a and a nut 27b are provided.
It is supported in a state of being tightened at a predetermined pressure by a shaft support mechanism 27 including a spring washer 27c.

Therefore, the second coupling element 22 is rotatable by being applied with a constant rotational power from the outside,
When the power is released, the angular position is stably maintained. In addition, as shown in FIG.
The rotation range of the connecting element 22 is limited by the connecting wall Z. That is, the rotation range of the second coupling element 22 starts at an angular position substantially equal to the extension line O of the axis of the first coupling element 21, and as shown by a two-dot chain line, a part of the second coupling element 22 ′. Is limited to a range θ up to an angular position (an angular position formed by a plane H substantially parallel to the mounting surface of the vehicle body wall 1) in contact with the upper edge of the connecting wall Z.

Returning to FIG. As described above, the screw rod 25 provided at the other end of the first coupling element 21 of the first and second coupling elements 21 and 22 whose one end is pivotally supported by the pivot support section 23, It is embedded in the top of the antenna mounting base 11 and can be detachably screwed into a screw hole 16 connected to the hot side of the feeder 11a. A screw rod 15 provided at the base end of the rod-shaped antenna 12 can be detachably screwed into a screw hole 26 provided at the other end of the second coupling element 22. The screw rod 15 and the screw rod 25 have exactly the same dimensions. Therefore, the screw rod 15 can be screwed into the screw hole 16.

Reference numeral 28 denotes a fixing nut for fixing the screwed state of the screw rod 25 to the screw hole 16.
The fixing nut 28 is attached to the screw rod 2 when assembling.
5 is screwed in advance. This fixing nut 28
Is a concave portion 29 having a conical surface that closely fits the conical surface of the top surface of the antenna mounting base 11.

When the fixing nut 28 is loosened, the screw rod 25 can be freely screwed into or removed from the screw hole 16 of the antenna mounting base 11. Therefore, the operation of attaching and detaching the antenna supporting angle variable member 24 to and from the antenna mounting base 11 can be performed freely. When the threaded rod 25 is in a predetermined threaded state (including everything from the initial threading state to the threaded termination state), when the fixing nut 28 is tightened, the threaded state is fixed as it is. You.

Therefore, the first coupling element 21 is provided with a predetermined rotation angle around the axis, that is, an antenna support angle variable member 24.
However, when the fixing nut 28 is tightened when it is oriented in a certain direction, the antenna supporting angle variable member 2
4, that is, the rod antenna 12 is in a state where the support angle can be variably set at a predetermined azimuth. The above orientation is
In a normal case, the direction is set to match the front-back direction of the vehicle.

A protective cover 30 is put on the outer periphery of the variable antenna support angle member 24. The protective cover 30 is integrally formed in a substantially cylindrical shape using, for example, a rubbery elastic member so as to allow a variable support angle setting operation of the antenna support angle variable member 24. At one end of the protective cover 30, a fitting portion 30a that fits around the outer periphery of the fixed nut 28 is formed, and at the other end of the protective cover 30, a base end of the rod-shaped antenna 12 is formed. Fitting portion 30b fitted into the conical concave portion 14
Are formed. Further, a plurality of ring-shaped folds 30c are formed on the peripheral wall of the protective cover 30 so as to be easily deformed by a bending operation.

It is preferable that an index is provided on the outer surface of the protective cover 30 to indicate a variable direction of the support angle of the variable antenna support angle member 24, that is, a rotation direction of the rod-shaped antenna 12 about the shaft support portion 23. As this index, for example, the both sides of the protective cover 30 covering the pivot portion 23 are bulged in the shape of an ear, and if necessary, are given a predetermined color so that the rod-shaped antenna 12 can be raised and lowered around this portion. Is possible.

(Experimental Example) In this experimental example, a variable antenna support angle mechanism 20 manufactured in the same manner as that shown in FIGS.
Using the experimental product V having the antenna and the standard product W not having the variable antenna support angle mechanism 20 as a comparison sample, the S / N sensitivity for the AM wave and the S / N sensitivity for the FM wave were measured. The difference was evaluated.

FIG. 4 shows "Sensitivity measurement results at 10% AM distortion", that is, the experimental sample V (three aspects: V1 to V3) and the standard sample W were used as comparison samples, and S at the time of AM wave reception.
S./N ratio is about 20 dB. FIG. 9 is a diagram illustrating a result of actually measuring a frequency characteristic of a G output (sensitivity).

FIG. 5 shows “Sensitivity measurement result at FM 3% distortion rate”, that is, the experimental product V (three aspects: V1 to V3).
And a standard product W as a sample for comparison, and the S.N. ratio at the time of FM wave reception becomes about 30 dB. FIG. 9 is a diagram illustrating a result of actually measuring a frequency characteristic of a G output (sensitivity).

In FIGS. 4 and 5, "standard 400 mm
"(W)" indicates that the genuine mounting rod-shaped antenna 12 having a rod length of 400 mm is directly connected to the antenna mounting base 11. "Joint extension (V1)"
A case is shown in which an extended antenna supporting angle variable mechanism 20 is interposed between the antenna mounting base 11 and the rod-shaped antenna 12, and the rod-shaped antenna 12 is supported at an angle of about 50 ° with respect to the vehicle body wall 1. Also "joint bending (V2)"
This means that the variable antenna support angle mechanism 20 interposed between the antenna mounting base 11 and the rod-shaped antenna 12 is bent, and the rod-shaped antenna 12 is lowered at an angle substantially parallel to the vehicle body wall 1. Further, "joint with water (V3)" indicates a case where the same condition as "joint extension (V1)" is satisfied and the antenna supporting angle variable mechanism 20 is wet with water to create a wet state. I have.

As can be seen from the measured results in FIG. 4, the sensitivity of the experimental product V is not inferior to the standard product W irrespective of the mode of use V1 to V3.
In the case of "1)", that is, in the case where the variable antenna support angle mechanism 20 in the extended state is interposed, it is found that a high sensitivity that is superior to the standard product W can be obtained.

As can be seen from the measurement results in FIG. 5, in the relatively high frequency band 84 to 90 MHz, the experimental product V
With respect to the standard product W, the sensitivity is improved in the case of "joint bending (V2)", that is, when the interposed antenna supporting angle variable mechanism 20 is bent, but the "joint extension (V1)" In the case of "water-filled (V3)", that is, when the interposed antenna supporting angle variable mechanism 20 was extended, it was found that the sensitivity was reduced as compared with the standard product W.

The above-described phenomenon is caused by the fact that the AM antenna is provided with the variable antenna support angle mechanism 20 so that the rod-shaped antenna 1
2 is increased, and the sensitivity is improved because of shifting to a direction suitable for the reception wavelength. For FM waves, the rod-shaped antenna 12
It is considered that the electrical length of the optical signal increases, and conversely, it shifts to a direction that is not suitable for the reception wavelength. It was experimentally confirmed that if appropriate measures (such as adjustment of the effective antenna length) were taken in consideration of these points, the antenna could be used without any practical problems.

(Modification) The rod antenna for a vehicle shown in the embodiment includes the following modifications.・ A plurality of (for example, two) antenna supporting angle variable mechanisms 20
The rod-shaped antenna 21 can be bent not only in the vertical direction but also in the horizontal direction, etc. by being used in combination. The screw rod 25 of the first coupling element 21 in the variable antenna support angle member 24 is screwed into a screw hole (not shown) provided at the base end of the rod-shaped antenna 12, and the variable antenna support angle member 2 is used.
4, the screw hole 26 of the second coupling element 22 is screwed with a screw rod (not shown) provided on the top of the antenna mounting base 11.

(Summary of Features in the Embodiment) The features of the variable antenna support angle mechanism and the rod antenna device for a vehicle using this mechanism shown in the embodiments (including the modifications) are summarized as follows. is there. [1] The variable antenna support angle mechanism described in the embodiment includes:
An antenna mounting base (11) mounted on a vehicle body wall (1) and a rod-shaped antenna having a base end screwed to the base (11).
(12), a pair of coupling elements (21), (22) that are provided so as to be removably interposable, and are rotatably supported at one ends thereof so as to be relatively rotatable. The other end of the first coupling element (21) has a screw rod (25) that can be detachably screwed to either the antenna mounting base (11) or the rod antenna (12). The other end of the second coupling element (22) has a screw hole () which can be detachably screwed to either the antenna mounting base (11) or the rod antenna (12). 26) a fixing nut for fixing the screwed state of the screw rod (25) to one of the antenna mounting base (11) and the rod-shaped antenna (12); (28), and the support angle of the rod-shaped antenna (12) can be variably set in a predetermined azimuth.

In the above-described variable antenna support angle mechanism, there has been a demand to replace the existing support angle fixed type vehicle rod antenna device with a variable support angle variable vehicle rod antenna device. In case, antenna mounting base
It is sufficient to remove the rod-shaped antenna (12) from (11) and simply interpose the antenna supporting angle variable mechanism (20) between them. That is, by doing so, this rod antenna device for a vehicle can adjust the support angle of the rod antenna (12) to the antenna mounting base (1).
It transforms into a rod antenna device for vehicles with a variable support angle that can be changed freely to 1). For this reason, when there is a risk that the rod-shaped antenna (12) may come into contact with surrounding obstacles when washing the car or putting it in the garage, the variable antenna support angle mechanism (20) is bent so that the rod-shaped antenna (12) is turned down. In this state, the rod-shaped antenna (12) can be prevented from being bent or damaged. Thus, by simply interposing an inexpensive antenna supporting angle variable mechanism (20) in the existing supporting angle fixed type vehicle rod antenna device, the above supporting angle fixed type vehicle rod antenna device can be used for a variable supporting angle type vehicle antenna. It can be easily transformed into a rod-shaped antenna device.

Even if the variable antenna support angle mechanism (20) is interposed between the antenna mounting base (11) and the rod-shaped antenna (12), the performance of the antenna does not fluctuate so much and the antenna can be used without any hindrance. It was confirmed experimentally. [2] The variable antenna support angle mechanism shown in the embodiment
The variable antenna support angle mechanism (20) according to the above [1], wherein an outer periphery of the variable antenna support angle member (24) is configured to allow a variable support angle setting operation of the variable antenna support angle member (24). And a protective cover (30) made of an elastic member.

In the above-described variable antenna support angle mechanism, the antenna support angle variable member (2
4) is covered from the outside, so the antenna support angle variable member (2
4) It is possible to prevent direct exposure to wind and rain, etc., and to achieve protection.
It is also preferable in appearance. Further, since the inside is not visible from the outside, the antenna supporting angle variable member (24) can be prevented from being stolen. [3] The variable antenna support angle mechanism described in the embodiment is
The variable antenna support angle mechanism (20) according to the above [2], wherein the protective cover (30) has an index indicating a variable support angle direction of the variable antenna support angle member (24).

In the above-described variable antenna support angle mechanism (20), the azimuth of the rod-shaped antenna (12) can be clearly determined from the outside. Can be prevented from being broken by excessive force. [4] The vehicular rod-shaped antenna device shown in the embodiment includes:
An antenna mounting base (11) mounted on a vehicle body wall (1), a rod-shaped antenna (12) having a base end detachably screwed to the antenna mounting base (11), and a rod-shaped antenna
(12) and the antenna mounting base (11), an antenna supporting angle variable mechanism (20) which is removably inserted, and the antenna supporting angle variable mechanism (20) is configured such that one ends thereof are relatively opposed to each other. A pair of coupling elements (21) and (22) pivotally supported so that they can be rotated
The other end of the first coupling element (21) has a screw rod (25) detachably screwable to one of the antenna mounting base (11) and the rod-shaped antenna (12). ), And the other end of the second coupling element (22) has a screw hole detachably screwable to one of the antenna mounting base (11) and the rod-shaped antenna (12). (26) An antenna supporting angle variable member (24), and a fixing for fixing a screwed state of the screw rod (25) to one of the antenna mounting base (11) and the rod-shaped antenna (12). Nuts (2
8).

The above-described rod antenna for a vehicle has exactly the same functions as those designed and manufactured as a rod antenna for a vehicle with a variable support angle that can be raised and lowered from the beginning. That is, when there is a risk that the rod-shaped antenna (12) may come into contact with surrounding obstacles at the time of washing the car or entering the garage, the antenna supporting angle variable mechanism (20) is bent and the rod-shaped antenna (12) is bent. By making the antenna face down, the rod-shaped antenna (12) can be prevented from being broken or damaged. In addition, since the variable antenna support angle mechanism (20) is detachable, if the variable antenna support angle mechanism (20) itself is damaged, it can be easily replaced and the FM wave reception sensitivity of the antenna can be reduced. Under circumstances where emphasis is required, it is easy to remove and use the variable antenna support angle mechanism (20).

[0038]

According to the present invention, an antenna supporting angle variable mechanism capable of transforming an existing supporting angle fixed type vehicle rod antenna apparatus into a variable supporting angle type vehicle rod antenna apparatus, and this mechanism. And a rod antenna device for a vehicle having:

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a rod antenna device for a vehicle according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a specific configuration of an antenna supporting angle variable mechanism according to the first embodiment of the present invention.

FIG. 3 is a view more specifically showing the structure of the antenna supporting angle variable member according to the first embodiment of the present invention.

FIG. 4 is a view showing actual measurement results of an experimental example (S / N sensitivity measurement for AM wave) of the rod antenna device for a vehicle according to the first embodiment of the present invention.

FIG. 5 is a diagram showing actual measurement results of an experimental example (S / N sensitivity measurement for FM waves) of the rod antenna device for a vehicle according to the first embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Car body wall 2 ... Antenna mounting hole 10 ... Antenna main body 11 ... Antenna mounting base 12 ... Rod antenna 15, 25 ... Screw rod 16, 26 ... Screw hole 20 ... Variable antenna support angle mechanism 21, 22 ... First and second Coupling element 23 ... Shaft support 24 ... Antenna support angle variable member 27 ... Shaft support mechanism 28 ... Fixing nut 30 ... Protective cover

Claims (3)

[Claims] 1. A mechanism provided so as to be removably insertable between an antenna mounting base mounted on a vehicle body wall and a rod-shaped antenna whose base end is screwed to the base. And a pair of coupling elements that are rotatably supported at one end with each other, and the other end of the first coupling element is connected to either the antenna mounting base or the rod-shaped antenna. The other end of the second coupling element has a screw hole detachably screwable to either the antenna mounting base or the rod-shaped antenna. An antenna supporting angle variable member, and a fixing nut for fixing a screwed state of the screw rod to one of the antenna mounting base or the rod antenna, and a supporting angle of the rod antenna, Place Antenna support angle variable mechanism constituting a variable can be set in the azimuth. 2. The apparatus according to claim 1, further comprising a protective cover made of an elastic member covering an outer periphery of said variable antenna support angle member so as to allow a variable operation of the variable support angle member. 2. The variable antenna support angle mechanism according to 1. 3. An antenna mounting base mounted on a vehicle body wall, a rod-shaped antenna whose base end is removably screwed to the antenna mounting base, and between the rod-shaped antenna and the antenna mounting base. To
A variable antenna support angle mechanism that is detachably inserted, the antenna support angle variable mechanism having a pair of coupling elements that are pivotally supported such that one ends thereof are relatively rotatable; The other end of the coupling element is a screw rod that can be removably screwed to either the antenna mounting base or the rod antenna,
An antenna supporting angle variable member, wherein the other end of the second coupling element is a screw hole that can be detachably screwed into one of the antenna mounting base and the rod antenna; and the antenna mounting base. Or a fixing nut for fixing a screwed state of the screw rod to one of the rod-shaped antennas.