I did a lot of research on these and bought a itrip auto. Right after I got it, I sat in the parking lot and went up and down the dial a frequency at a time to find just one decent open station to use it with and had no luck. I'm quite aware of the shortcoming of these devices. For the last 3 years, I've used a Griffin Roadtrip (interesting because they are made by the same company) and just for comparison sake, right after I tried to get the itrip to work, I plugged my iPhone 3G into the Roadtrip, and the difference was like night and day. The Roadtrip actually overpowers strong radio stations in my area ... as a matter of fact, when I used to use it with my ipod, that's what I would do. I wouldn't search for an empty frequency, I would just find some really strong hispanic station, tune the roadtrip to it, and could listen static free. The itrip was a huge disappointment. I would say that it had about 20% of the power that the roadtrip did. The guy at Bestbuy (who I'm sure is far from an authority on the subject) said that the FCC has been clamping down on the output of these sorts of devices which really makes them pretty ineffective ... unless you have the perfect car stereo system where the itrip is close enough to the antenna, etc. I know that a lot of these devices can go into the "international mode" to find a clearer frequency, but honestly, I was so turned off by the lack of quality in the itrip that I just took it right back. My suggestion to you is to buy one from a place like Bestbuy and try it in your car first so that you can just easily return it if it doesn't work. (I would've be happy with just using my iphone with the roadtrip but it doesn't charge it at the same time.)