The vehicle antenna refers to the mobile communication antenna designed and installed on the vehicle, and the most common is the sucker antenna. 

Because the sucker antenna is easy to install and place, the sucker antenna is often used instead of the base antenna in some simple situations. 

In the structure of vehicle antenna, there are shortened antenna, 1/4 wavelength antenna, middle sensing antenna, 5/8 wavelength antenna, double 1/2 wavelength antenna and so on. Theoretically, their efficiency increases in turn, and the length of the antenna in the working frequency band also increases in turn. 

Due to the limited height of the vehicle itself, coupled with the wind resistance formed by excessively long antennas when the vehicle is moving at high speed, crossing bridges and entering underground garages are all problems, so the vehicle antenna is not as long as the better. the car antenna is generally required to be no more than 70cm. Vans require shorter antennas. 

The shortened antenna is small in size and low in gain, but it is suitable for use in situations where concealed antennas are needed. 

General police vehicles are recommended to install high-increase antennas, especially in vehicles with large activity area. 350MHZ high-gain antennas are mostly divided into the form of 5/8-wavelength induction, and there is an induction coil at the distance of 1/2 wavelengths from the top of the antenna. 

The dual 1/2 wavelength antenna in the 400MHZ band has a high gain, and its appearance is characterized by two inductance coils on the vibrator of the antenna. 

Five-eighths of the wavelength antenna and the middle inductive antenna also have higher gain and cheaper price, so they are widely used. 

The sucker antenna with high gain can be considered when it is used as a temporary fixed station antenna, and the length of the antenna does not need to be too limited. 

Because the sucker antenna is designed according to the environment of the car, it will be better to absorb a metal plate (such as iron sheet) with a radius of more than 1 meter when it is used as a fixed. 

As the imported original vehicle antenna is very expensive and the advantage is not prominent, so the domestic vehicle antenna is generally selected. 

In the stage of antenna selection, the shape and gain of the antenna are mainly referred to. 

It is recommended to choose famous brand products from large manufacturers, the authenticity of the parameters they provide is relatively high, and the manufacturing process is also guaranteed. 

If it is a batch purchase, you can go to the professional antenna manufacturer to customize according to the use frequency band, in order to obtain the best use effect.