Is that still going on? I can remember back in 1958, when I was a teenager, I knew another teenager, especially oriented toward electronics, who built and operated a radio station that transmitted an AM signal that traveled on power lines and broadcast quality radio to homes in the vicinity. Completely legal, in this case.
Being interested in a radio career, I participated as an announcer/DJ on this cool station. It was good training.
Still going on at least up to the mid 90’s; during the klintoon era there were alot of them rebroadcasting satellite audio from anti klintoon broadcasters.
Not sure now
Interesting about using the AC wires ;)