I want to add a decently powered (~5 mile range) FM transmitter to my car stereo, a something like a radio station on wheels. I want to be able to listen to music from my car on any FM reciver within range. I think this would be really cool when I'm at a ski resort, and rather than bringing a limited amount of music with me in my mp3 player, I could bring a small FM tuner, which would be small, never skip, power-conserative, etc.

How hard would this be to accomplish? What kind of hardware would I need? What kind of antenna could I use? I'm assuming my power antenna can't be used to broadcast as well.

I've always dreamed of doing something like this, and was wondering if anyone has done something similar, or if there is a reason it wouldn't work at all.

Thanks!
- Eli