I think FE is talking about the Ramsey Transmitters. So, I guess I should explain how I do it. I know a few people that I know just hook up one of the cd players that can play MP3 and just hook that up to a Ramsey and let it go. When I had one, I had the cheap transmitter. The one that only cost about 40 bucks. And it did pretty good till my puppy got a hold of it and ran down the hall with it. I also thought it was important to broadcast because it doesn't interfere with the neighbors. It you want people driving by in a car to hear your music or what ever, you certainly don't want the neighbors to complain about the music. This way people that drive by in a car can listen to your music without having to get out of the cars. Most of the boards that Ramsey has are just kits. You can buy them already soldered, but it takes a little more time. So order early. But if you know how to solder and are good with resistor codes, caps, and diodes then you should have no problem with building this transmitter. The documentation is really good. They try to explain where each part goes on the board. Which to someone who hasn't done it before you shouldn't have too much problems. But after you get your Transmitter put together, you can use batteries or use a power adapter to power up your Transmitter. Each transmitter can be set to Transmitter at any frequency. But which frequency should you use to get a good signal. Good question. Some areas have a lot of FM Radio stations so it might be hard to find a good station for people to hear a good clean signal. But if you check out this website it should give you a list of Frequencies that you can use with your transmitter.
http://www.radio-locator.com/cgi-bin/vacant
Now I mentioned before that you can just hook up a cd player to this thing but I do it a little different. I hook this up to the computer and I use otsturnable, which you can see it here.
http://otsturntables.com/ They have some other software but this one is really good. And you don't need the pro version, which cost around 80 bucks. The basic one, which is around 30 bucks, is just as good for what you may want to do. They have a free version you can download off the Internet. And if you have windows XP you can use your scheduler to have this software turn on at certain times and then back off. I like how it mixes the audio with the next song so it sounds like a radio station. And there you have it, and questions.