For hands free phone calls

For voice calls with your phone, some cars have voice activated features, etc.

It's all crap I don't need.

Bluetooth phone calls?

So my mom can call me because she's lost, but doesn't want to stop to check her Google maps because she's in a "dangerous part of town" (downtown Seattle).

(My mum's not a bigot btw, she just lived in a village of 1000 people until she was 29 and anywhere with more than 20 people at once makes her anxious. Costco trips also have her on alert like she's part of Seal Team Six)

To kill the antenna with these you need to pull trim off the car to access the antenna plugs. Pulling the fuse takes 30 seconds and doesn't require tools unless you have fat fingers like me and can't grip the fuse to pull it.

Also, this could kill your FM/AM radio access depending on how things are wired and that may not be for everyone.

Good to know these exist though