Maybe you would be better investing in a new radio, with a dedicated line in socket. That way you could run a cable between your player and radio.
You will get much better sound like this, with no radio interference.
I am a truck driver and I am looking for an mp3 player that is very loud, all the ones I have had in the past just are to low in volume to hear in a semi regardless of the headphones I try, also I have tried a fm transmitter player (lexar ldp-600fb) but it was useless as it would barely transmit on a portable radio with the antennas touching, it didn't work at all in my car or truck. I would appreciate any recommendations on a mp3 player that has a strong built in fm transmitter (or a stand alone transmitter that works off a cig lighter) around 1 gig and will play at least 12 hours on a charge or preferably has a 12v power cord that plugs into a lighter. The lower the cost the better. Thanks