There is a button on the outlet plate where I connect the TV coaxial cable, that switches the input from cable TV over to the antenna. If you have one of those buttons maybe you're on 'cable' mode. We use HDTV quite often and when I have the button in the wrong position I have the same symptoms you do - poor reception and fuzz everywhere. My antenna does have a crank for raising it, but that's another issue. If you have transmitters that close than almost any antenna should work provided it is correctly connected through to the receiver in your TV.