Ah Ha! Thank you!! Sadly when I scan for channels using my TV tuner i get 25 channels. When the the dtv system scans for channels, I only end up with 17. I wish the HR34 & AM21 would scan for channels in the same way my TV set does, or give the option of adding channels on our own.
The way to find the channels the HR34 finds in a scan is if they have "Regular Schedule" for guide data and not actual guide data.