If there is a host with navigation, there is also a GPS antenna inside. 08 Jie Jun is an ornament, antenna or window antenna! But the more important reason is aerodynamic considerations. When the car is in air movement, it will drag out a long whirlpool. When this vortex breaks at the rear of the car, it is easy to produce pressure resistance. Scrambling the vane at the right position (a term in aircraft design) can force the airflow to transition ahead of time, from laminar flow to turbulent flow, reducing friction resistance and piezoresistance just mentioned. I think there are aesthetic considerations in making such a shape. After all, where the antenna is placed is largely arbitrary.