Why don't some cars have shark fins?

Reasons why some cars don't have shark fin: 1. Patent problem: This shark fin was first introduced by BMW, but BMW made this antenna into the shape of shark fin. This design helps to reduce air resistance, and the antenna itself integrates many functions, including reducing static electricity and enhancing signals. The shark fin antenna has been patented by BMW, and the design needs to pay BMW a certain fee. 2. Function conflict: Many times, the car itself already has an antenna and integrates various functions such as function enhancement signals, and it is not necessary to install a shark fin antenna. Although shark fin antenna has other functions, such as aesthetic fashion and reducing air resistance, its essence is that the antenna conflicts with the original antenna. Naturally, some cars with existing antennas do not have shark fins.