This is another one of those situations where driving an older Dodge Grand Caravan pays off.
I read somewhere the top vehicles they target are BMW, Audi, Range Rover and Honda.
It's not legal to use encryption:
https://www.offgridweb.com/preparation/encrypted-radios-aes-256/#:~:text=And%2C of course%2C if your,walkie-talkies) is illegal.