Okay, I think the signal beams down from a satellite. England and the US are the same in that respect.
Then the US gets all independant (rings a bell). Because the country is so big, local transmitters bump the signal to try and get an even transmission. In England and Germany you just buy the radio and pick up any station for free. In the US, as far as I can see, you pay in the same way as you would for satellite TV, via subscription and encryption codes.
But they are still only receiving, not transmitting. So there is still nothing within the radio to record where that radio is. Like satellite TV - you pay subs, but nothing beams back to tell the satellite which programme you are watching.
So I think.....really, just think.....that even your local satellite 'bumpers' don't have any in-built technology to tell them when they are beaming out to someone, and where that person is. They just beam out all the time, and a person can access that 'beam' if they have paid for the encryption code.
I hope a geek never reads this; I will be sent to the geeky stupid step forever.