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

The shark fin can be a number of things. It’s most often used as a satellite radio antenna, and sometimes a GPS antenna as well (my last two cars had shark fins but did not have GPS navigation built in). Multiple antennas are most often either ham radio folks who have rigs set up in their car or unmarked cops.