check this link out

http://www.qatarliving.com/discussion/ipod-dilemma-07jan2007

Although i haven't got a IPOD FM modulator as i do not trust the clarity and tranmission. I've read about wired FM modulators - where one connects the wire to the car radio aerial which will give better clarity and transmission than from a FM frequency. Check with the car audio guys out in the Qatar(arnd sanaa rdabt) but they said they can't help fix the wire to the aerial.

I've heard Belkin gives good performance. There are also FM modulators for the ipod available at the Apple store in THE MALL. Haven't check them out.