What is the purpose of the shark fin-like thing on the car roof?

[DeWalker]

The functions of the shark fin-like thing on the car roof include: 1. It can intercept high-frequency radio waves emitted by the transmitter and transmit these intercepted waves to the receivers of car phones, radios, and wireless navigation devices, then adjust the carrier wave; 2. It can help release static electricity; 3. It can enhance signal reception; 4. While driving, it can overcome air resistance, preventing interference with the car. The shark fin on the car is essentially the car's antenna. If the car is equipped with wireless transmission devices like radios or car phones, the signal can become very poor when driving in mountainous areas. Installing a shark fin can be very useful in such cases, as it significantly enhances the signal reception inside the car.