when I install the SCI ATL 4200hd with a 16 by 9 tv I have trouble getting the picture to fill the screen at all times. I know that i could just zoom in on the picture and have a full screen with no bars on the sides or bottem. I don't want to lose any of the picture on the HD channels. What I am looking to do is have the HD channels that are broadcast 16 by 9 not be streatched while the 4 by 3 channels are. How are you guys setting your installs up. Does anyone know if there is a setting in the cable box that will acomplish this?