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What is the purpose of the antenna on a car roof?

1 Answers

DeKimberly

07/29/25 12:47pm

The antenna on a car roof, also known as a car antenna, serves the following purposes: 1. Primarily used to receive external signals, enabling the driver to listen to the radio inside the car. 2. In addition to receiving signals, the car antenna also acts as a static electricity discharger, releasing static electricity accumulated on the car's body to protect passengers and the vehicle's circuitry. 3. For some high-end cars, the car antenna also has an aerodynamic function to reduce air turbulence. Below is a brief introduction to car antennas: (1) Considering the mobile usage conditions of cars, except for devices like ETC used in specific locations, general car antennas should be omnidirectional. (2) The basic single-axis antenna for cars should have a length of 1/4 of the received radio wavelength, but the length of antennas installed on cars is usually around 1m. (3) When installing multiple antennas in limited locations, factors such as ensuring antenna reception performance, preventing interference between antennas, feasibility of installation, and aesthetic appeal should be considered.

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