Smartenna is a neat little device that is easy to install, but should have been built into the stereo in the first place. What it does is, when listening to CD's, it overrides the stereo commands to raise the antenna and it keeps it down. Afterall, if you aren't listening to the radio, why should the antenna be up, i.e the head unit in the dash should have had this feature installed, but some engineer was too lazy to incorporate it. The only downfall of the Smartenna, is it is ignorant of use of the cassette deck in the dash. So if you are listening to cassettes, your antenna is waving in the air, adding drag, looking ugly, and accomplishing nothing. If you listen to CD's and want your antenna down, buy it. I did and it works great.