On several occasions now, I've been getting an echo in the audio of an OTA DT channel. It seems to only occur with the KRQE (CBS) OTA DT channel when broadcasting in HD. Has anyone else experienced this audio problem and did they find a solution for it. Is it the 921, the HD antenna or the way the channel is being broadcast? When the echo is occurring, you can't really tell what is being said. It's somewhat annoying so I tend to switch to 8811, the CBS local SD station.