There are 2 types of antenna available, the round saucer shaped Wineguard and the "JacK" style tunable antenna. The performance of the Jack is supposedly better than the Winegard. That said I'm dropping the antenna as I never used mine, always had cable or watched movies on the dvd built in with the tv. I had both and the Jack does seem to pull in more over the air signals, but again you have to be near civilization to get the signals and more than likely cable will be available.
never in doubt, often wrong