RE: XM Satalite Radio and Pcm
Ok, learned something, that it's similar in aproach to my car's cd player.
Still don't think it's an issue, as regular FM radio ststions broadcast on that same band with much stronger signals with no effect on our frequency band. The XM radio's transmit must be relatively weak if it's range is only up to 400 feet as you said.
Man, I HATE these unsolved mysteries.