My issues related to a few OTA channels I can easily get with my TV's OTA tuner (signal levels in the 70s and 80s) but can't get them on the HR20-700's tuner at all.
I posted a reply on page 1, but that was in the context of the guide data and the OTA database having all the channels mapped (since the DirecTV OTA turners don't actually scan for channels). As to reception, that is another matter. I live in a very localized weak signal/multipath pocket in metro Atlanta (I have 700 ft "mountain" about 1.5 miles away in the line of sight) and the HR20-700's ATSC tuner is not a stellar performer at all, even with a 4228 antenna and amplifier on the roof. My Samsung HLS6187W DLP's tuner and my Zenith DTT900 converter are each able to handle about 4 stations the HR20 cannot. The other stations are stronger and the HR20 handles them fine. But it is a marked difference in capability. I have read the HR20 has a dated ATSC OTA tuner that was not knows to perform as well as more modern tuners.