Q: Recently new cars have these fins on the top, back of the car. Can you see it, its above the back window of the beamer, whats it suppsoed to do? http://www.edbmw.com/photos/BMW5series_back.jpg
A: They are antenna's. They give you radio signals so you can listen to the radio. Some cars have the antenna built into the window and some have antennas that come out of the car.