Ebay FM Transmitters iPhone 4

http://cgi.ebay.com/FM-Transmitter-...945062?pt=PDA_Accessories&hash=item563f5864e6

When getting these, or any FM transmitter, the old saying of you get what you pay for is VERY true.

I've had quite a few of these transmitters and wound up returning all of them due to poor reception, crappy construction, etc, etc, etc.

Don't know how long you intend on keeping your car but I'd seriously recommend either modding your factory radio to direct connect with a 30 pin adapter OR go out and buy a cheapo head unit with an aux input. It'll be a little more expensive but well worth it in the long run IMO.

Hrm, looks like you're probably out of luck back there.

I might avoid the EBay route, but I did buy a Belkin FM transmitter from Best Buy about 7 years ago for my MP3 player to use in the car. It worked reasonably well so long as one of the frequencies you were trying to use wasn't close to a frequency of a passing radio station. In some larger cities, this was difficult. You'll want one that has more than one option for the frequency it transmits on.

I mainly used it for when I was traveling. These days, I got an AUX 6-disc adapter for my radio to use with the Sat Radio - it has a 1/8" plug that also works with my iPhone/iPod when I want to use it. That option doesn't appear to help you if that diagram is complete.