What purpose do sharks tooths serve?

Does the car have a factory nav system? The GPS antenna is usually something like that.
No. The car is a very basic model, didn't even come with a pushbutton to open the door.
 
My car has one but never had Sirius and the antenna is in the rear glass. That's why I was unsure of its purpose because it seems to have no function in my case. Would a fin be installed if there was no reason to have it, maybe as a standard item?
are you sure the antenna is in the rear glass?
 
Or they get a dummy shark fin antenna since it is simpler to punch a hole in the roof of every car.
 
are you sure the antenna is in the rear glass?
99%, but I'll double-check it.
For mass production purposes, it's possible that every example of a certain model gets the shark fin antenna, even if some examples do not have the feature that uses the antenna.
I thought that as well, but I've seen at least as many Camrys of my era without them as with them.

All that said, further investigation suggests that it's for satellite radio.
 
Maybe they put an antenna and wiring on every car so that a dealer can upgrade it to have satellite radio just by adding the radio box.
 
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