These FM transmitters, which use extremely low power levels relative to "real" radio and television broadcast transmitters, can be used on any frequency within the FM radio band (assuming you're in the United States; laws vary in different countries). Basically, you can use it as you want to broadcast any audio so long as you don't modify the device in any way to increase its power output (pretty sure that's correct). But, of course, there is the FCC Part 15 rules stating your device cannot cause harmful interference, and that it must accept any interference that it receives. I don't know how little power one of these devices can put out before it has to be licensed by the FCC.
As far as television channels, I don't know of any right or privilege the public has to use them. The small exception might be 87.7, which is the frequency that audio was broadcast on for channel six back when television was broadcast via analog signals (again, I'm assuming here that you're in the United States). However, most low power FM transmitters like these do not go any lower than 88.1 FM, if any of them do.
· 8 years ago