Bernie,
If you do end up going with a comtek transmitter in the 72-76mhz range and want to spend as little as possible then look at landmark, these are radios that have an extended freq. range down to 72mhz. I bought one off ebay for curiosity sake, it was $30, what the heck. It has a cheap feel to it and is noisier than a comtek but it worked, and for the price I keep as a back-up. You do get what you pay for. Good luck, David