I believe this is the model that looks like a radar detector. A friend of mine had bought Radio Shack's version of that last year. I had noticed that the signal was not good at all. However I got creative and decided to open it up to see what they were using for a transmitter antenna. Everything is so packed inside of it, it's amazing how it works. The piece of metal that they were using for the antenna was touching the heat sink, I moved the antenna off of it and that fixed the signal problem. Does this model have an 1/8" audio out jack on it? If your car stereo has a cassette player or better yet, an 1/8" aux input, you would be better off using that with the proper wire.