Eh, I'd look into FCC regulations, there are some laws against pirating radio waves, you must make sure that it passes ALL rules, There are some that regulate the distance a transmission could be heard from, and on what band, if it hogs a signal from a radio station, or from the military, they'll send out 3 of these nice unmarked trucks loaded with all kinda doohickeys to triangulate your exact position (accurate to within 10 feet) and depending on your "crime", slap you with a heavy fine.
So I'd definately pick up the FCC manual of rules and make sure your transmitter follows all of them. There's quite a few... somewhere in the range of 1000+.