Why some cars have antennas and some doesn’t, and what the “fin” looking like is doing?

Question

I see some cars have antennas (and some even have two) and some doesn’t.
Why is that? And why some have one or two what’s the matter with the count? And wha the matter with their length and the direction they are pointing?

And what’s the fin (𓂄) doing?

In: Engineering

Answer 1

In most newer cars the radio antenna is integrated into the rear windshield. The sharkfin antenna can be used for multiple things such as satellite radio, GPS and cellular data. Some people will also install aftermarket antennas for CB radios.