If you have an iPod, get the iTrip FM transmitter. The new generation iTrip will plug directly into the bottom of your ipod. It will give you the best signal and the best quality music with the most freedom. I have used all the different FM transmitter products, and iTrip is hands-down the best. It runs directly off the power from the ipod.. the new one is $30, its digital, and it broadcasts across all FM stations from 87.9-107.9 including even wavelengths.