What is the function of the shark fin on the roof of a car?

[PaigeDella]

The function of the shark fin on the roof of a car is to enhance signal reception and prevent static electricity. The shark fin on the roof of a car serves as the vehicle's antenna. If the car is equipped with devices like a radio or car phone that transmit wireless signals, the signal reception can become very poor when driving in mountainous areas. Installing a shark fin can significantly improve the signal reception inside the car. Additionally, the shark fin on the roof helps to discharge static electricity. During winter or dry autumn seasons, vehicles often accumulate static electricity. If this static electricity is not discharged, it can cause inconvenience to people and pose a significant hazard at gas stations.