https://phys.org/news/2018-11-antenna-concept-cars.html

This does mean, however, that new options need to be found for housing antennas in cars. At TU Wien, a special antenna box has been developed that can be integrated into the front area of the car roof. Detailed measurements show that the directionality of wireless signals is very good around cars, and with the new antenna variants cars are extremely well equipped for the wireless requirements of tomorrow.

The 'shark fin' is becoming too small