Good Signal with audio but no video. Help

[zimp]

Location: Portland, Or 97219
One TV connected to Terk HDTVa
TV is a Toshiba Cinema Series HD Rear Projection

On most channels I have very good reception (90+) but I am only able to get audio and no video. I receive both audio and video on a few channels, but the quality is very bad. I have read through the user manual, scanned channels repeatedly, switched inputs, reset TV.. but I am out of ideas. Does anyone have any suggestions?

Thanks
Zach

[tigerbangs]

You need a better antenna: preferably an outdoor, roof mounted antenna. You are experiencing severe multipath distortion, which manifests itself as tiling or intermittant picture, which may sometimes be accompanied by audio drop outs, as well...