First, enhance the signal. This may not be obvious for cars that drive in cities all the year round, but if you go to remote places, cars with shark fin antennas will be very different from cars without shark fin antennas. Without it, in remote places, listening to the radio may also be frustrating and inconvenient. Shark fin antenna can enhance the signal and listen to various broadcasts very smoothly.
Second, release body static electricity. Automobile static electricity is very common, especially in some dry seasons such as winter, and it is easy to generate too much static electricity. If static electricity is left in the car for a long time, opening the door is likely to get an electric shock. Refueling at gas stations may also bring security risks. In the past, in order to release static electricity, people would tie a chain to the tail of the exhaust pipe. Now with the shark fin antenna, there is no such trouble. It looks very atmospheric and beautiful.
The third function is to intercept the transmitted radio waves. Shark fin antenna can not only intercept these radio waves, but also transmit them to automobile equipment that needs all kinds of radio waves. It can be said that it is very useful. It is worth mentioning that some car owners think that shark fin antenna can reduce the resistance to the car body, thus reducing fuel consumption. In fact, from the design point of view, it does have such a role, but it is very limited in reducing fuel consumption. According to the data obtained from expert experiments, the installation of shark fin antenna can reduce fuel consumption by about 3%, and it should be at high speed. In practice, shark fin antenna seems to have little effect on reducing fuel consumption.