Did you try the adapter in another car to make sure that the adapters aren't defective, or there might be a problem with the wiring in your car? Find some empty FM frequencies at http://radio-locator.com/cgi-bin/vacant and try those if you haven't already. The more empty frequencies around the one you're using, the better, but it will work fine even if there's only one or two empty frequencies together.

I've had a C. Crane FM Transmitter, http://www.ccrane.com/radios/fm-transmitters/fm-transmitter.aspx , and that worked great no matter where I was, even downtown Chicago, San Antonio, etc., but it's not cheap.

Right now I have iRiver's FM transmitter, http://www.amazon.com/iRiver-AFT-100-Mobile-Transmitter/dp/B00067LYFW , that I picked up cheap on Woot!, and while it doesn't work so great in downtown major cities, it works great everywhere else, and it's definitely a lot cheapter.
Source(s):
Personal experience


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