I've tried tons of those FM transmitter thingies. They ALL sucked.
If I can't put in an aux adapter, I replace the radio. I got tired of mucking around and just do it right now.
When I was driving a sucky car - FORD tempo - LOOOOOL. Thanks to my father.
ALL the FM transmitter I bought from best buy, target, even the expensive ones sucks! they're all static-y so I return them all and gave up on FM transmitter. So now I have my MINI, did not even bother buying one. My husband bought a cheap one on ebay though and so I have no choice but to use it. It really has no static and really good. Oh, I actually use it on a company van - a chevy white van and it's the same no static. Not as good audio as in my MINI though. But yeah.
Why don't you try a BT adapter? If my FM transmitter breaks that's what I am gonna buy next. Just googled. Guess I am stuck with FM transmitter set up. Oh well.