What is the difference in performance between on-board CB Antenna and non-on-board CB Antenna?

Gain characteristics: On-board CB antennas usually need to work in limited space and complex vehicle environments, and their gain may be limited relative to non-on-board CB antennas. Non-on-board CB antennas can be designed and installed more optimally according to actual needs, and generally can achieve higher gain, so that they have better performance in signal transmission and reception, and can cover longer distances.
Directivity: In order to adapt to various directional changes during vehicle driving, on-board CB antennas are usually designed as omnidirectional antennas so that they can receive and transmit signals more evenly in different driving directions. Non-on-board CB antennas can choose directional or omnidirectional antennas according to specific usage scenarios and needs. Directional antennas can concentrate signal energy in a specific direction, improve signal strength and anti-interference capabilities, but they need to be accurately aligned with the target direction.
Anti-interference capability: On-board CB antennas are subject to various interferences from the vehicle's electrical system inside the vehicle, such as electromagnetic interference generated by the engine ignition system, on-board electronic equipment, etc. Therefore, on-board CB antennas need to have good anti-interference design and shielding measures. Non-car CB antennas are relatively more flexible in installation location and can be far away from interference sources. Their anti-interference ability depends more on their own design and the electromagnetic conditions of the surrounding environment.
Environmental adaptability: Car CB antennas need to adapt to various harsh environmental conditions during vehicle driving, such as vibration, impact, high and low temperature, humidity, etc. Therefore, car CB antennas must have high strength and stability, as well as good weather resistance in structural design and material selection. Although non-car CB antennas also need to consider environmental factors, different application scenarios have different requirements for their environmental adaptability.
Installation convenience: Car CB antennas need to consider the appearance, spatial layout and installation method of the vehicle. Usually, it is necessary to choose a suitable installation location, such as the roof, the rear of the car, etc., to ensure the performance of the antenna without affecting the normal use and safety of the vehicle. The installation of non-car CB antennas is relatively more flexible. You can choose to install them on the top of a building, a high tower, etc. according to actual needs, and the installation method is more diverse.