Due to strict regulations, consumer FM transmitters will always be somewhat disappointing. If you can't upgrade your car stereo or use an inexpensive cassette deck adapter, at least spend a little more money for a transmitter with better broadcast quality.
Donald Bell offers his review of the DLO TuneStik iPod FM transmitter.
The DLO TuneStik remote now features a display for reading FM frequencies.
TuneStik transmits iPod tunes to any radio via remote control.