In today's systems I continue to hook up like this.

Source over HDMI -> Receiver -> HDTV and one final optical from the HDTV back to the receiver for OTA play.

If you are using COAX or RCA jacks that's not HD so something's off right there. Also you could be in trouble since I rarely see COAX standard def content to be more than stereo so there again, another issue.

Something's not right but there are so many missing model numbers that I can't look at this further.