idsrvit

Does anyone know if there is an advanced antenna on the market for tv tuner use? I have the Pioneer AVHP-7500 with built in tv tuner, and get decent reception, but I have just read a review for the Cadillac Escalade, and saw that the 06 models are coming out with a tv tuner with some sort of enhanced global tracking (much like satellite tv, but for reg cable broadcast that are captured via antenna). ????
thanks