I have noticed that the 622 seems to have a very good OTA tuner. I have experience with several ATSC tuners, some DISH and some not. They would include:
-US Digital/Hisense DB-2010 (Wal*Mart carried it)
-LG LST-3510A
-DISH 811s
-DISH 622
-integral ATSC tuner in Panasonic TH-42PD50U
-integral ATSC tuner in Sanyo PDP-42WV1ASB
The performance of the tuners in the various units seems to vary considerably. I realize that I probably don't have an optimum antenna set-up. When we bought our home about it had a dual-band log periodic in the attic. Some months back I swapped it out for a Channel Master CM 4228 8-Bay Bowtie UHF Antenna, but it is still in the attic above the attached garage. We are about 20 miles from most of the transmitters according to http://www.antennaweb.org, but one of them is a little more than 50 miles. (Most of them are 355/357 degrees, but the 50 mile station is 324 degrees.) Anyway, when I did the first channel scan of local over the air digital broadcast stations, I got ALL 22 channels that I wanted! I don't think that has ever happened with ANY of the tuners that I have used in the past. From what I seem to recall reading in the past, I was quite likely having issues with MPDI (multi-path distortion interference). With the other units I had to tweak the antenna. I would move it a little bit one way and gain some channels and lose some others, but not so with the 622. I was ever so slightly disappointed that the 622 doesn't stall have the old NTSC tuner, but it is not a real big deal to me. There are a few channels that are NTSC only, but they are low power and not of great interest to me, but I can still get them with the NTSC tuner built in to my Panasonic TV set.
-US Digital/Hisense DB-2010 (Wal*Mart carried it)
-LG LST-3510A
-DISH 811s
-DISH 622
-integral ATSC tuner in Panasonic TH-42PD50U
-integral ATSC tuner in Sanyo PDP-42WV1ASB
The performance of the tuners in the various units seems to vary considerably. I realize that I probably don't have an optimum antenna set-up. When we bought our home about it had a dual-band log periodic in the attic. Some months back I swapped it out for a Channel Master CM 4228 8-Bay Bowtie UHF Antenna, but it is still in the attic above the attached garage. We are about 20 miles from most of the transmitters according to http://www.antennaweb.org, but one of them is a little more than 50 miles. (Most of them are 355/357 degrees, but the 50 mile station is 324 degrees.) Anyway, when I did the first channel scan of local over the air digital broadcast stations, I got ALL 22 channels that I wanted! I don't think that has ever happened with ANY of the tuners that I have used in the past. From what I seem to recall reading in the past, I was quite likely having issues with MPDI (multi-path distortion interference). With the other units I had to tweak the antenna. I would move it a little bit one way and gain some channels and lose some others, but not so with the 622. I was ever so slightly disappointed that the 622 doesn't stall have the old NTSC tuner, but it is not a real big deal to me. There are a few channels that are NTSC only, but they are low power and not of great interest to me, but I can still get them with the NTSC tuner built in to my Panasonic TV set.