Ah, geez, sorry to hear that, Gary 
I had no idea.
I thought maybe yours was broadcasting maybe like a local college station. There must be a zillion like yours though? Thanks Phil - I'm not sure what you mean by "a zillion like yours" though. How many people own an FM transmitter?
I'm not really complaining about this. I got away with it for 12 years in two locations. It was totally against FCC regulations. There's no way I could be licensed - and really wouldn't want to be anyway.
JD - well AM is like a step down- the sound quality sucks and I don't happen to own an AM transmitter anyway.
I have thought about changing frequencies and continuing, but I don't think I will since one visit from Feds is enough for me and I don't need to get into any more trouble. I can't afford to be fined.
Also not sure if I should continue the internet thing. It's also not above board. Might be time to close the whole thing down and consider myself lucky. Not worth the hassle.