Are you talking about the old fashioned antenna that looks kind of like a Christmas tree? If so that is your problem. The airwaves for HDTV are digital not analog. This will cause a difference in how your videos and games are played as well as TV itself. You need an e-field antenna which looks like something you'd see rotating on an airport flightline. You also need to configure your HDTV. Your owners manual should tell you how to do this but i would wait til I get the new antenna. You may also need special cables. Good luck, Susu



