One last thought...

There are a lot of little FM transmitters out there that may work for your situation (I've seen them at Radio Shack, Target, etc.). These are made for plugging your iPod into and transmitting the stereo sound into your car or home FM receiver. I have one around my house somewhere and I've used it for sending my audio out from a small mixing board into the client's FM receiver. In my case it was so my audio could be heard on the outside of the building through the restaurant's audio system while I played inside. Just an idea...