If you do, the FCC will hunt you down faster than you or anyone else can imagine. This subject has popped up here from time to time, and this same answer is still just as valid. If you use this transmitter and broadcast on a commercial frequency that the FCC guarantees those who use it legally and pay a heavy licensing fee each year, then they will throw the book at you. Huge fine and probable jail time. Even 100 watts of your broadcast will interfere and cause legitimate station owners loss of revenue. They may sue as well. Don't treat any of this lightly; this isn't a CB frequency and it is protected!