So the nice thing about FM radios is that you can actually transmit on the FM radio band legally. Then you can broadcast your own music or whatever and listen through your house or a small area.

These low power FM transmitters were very popular during covid when churches would have everyone sit in the parking lots. They'd just tune in and all listen together.

Basically, FM radio isn't just passive receive. I've also done some small pirate radio, it's quite fun.