FM Modulator
I Installed an FM modulator, on my 2002 Ford.It came with the XM radio ,I replaced, because the other one was hit by a powersuge, that fried the reciever.We live in Central British Columbia ,right in the mountains.
The FM modulator does improve the sound quality, is easy to install, but it is still affected by FM stations, so you will still have to change frequencies,when there is an FM station, on the same frequency as your Satellite reciever
When I sold my Ford in the spring, I installed the FM modulator ,on my 08 Tacoma, and the sound is excellent. I did try it without the FM modulator, but the sound was impaired, as if you were listeneing to a FM staion far away. Hope this helps,Pacific pete