Well, after getting my 55" Mitsu 55813 RPTV a couple of weeks ago, I began a quest on how to best get HD locals OTA. Well, after screwing around with several antenna including the Zenith Silver Sensor, a Radio Shack Omnidirectional dish, and the Channel Master Stealthtenna, I came to the realization that I had feared: my neighborhood in Bellevue is a OTA dead zone. The only thing I could get was WKRN (ABC) since their tower is to the southwest of me where line of sight is easy. WSMV (NBC) is about the same distance as WKRN, but it's blocks by several hills between my house and Knob Hill where WSMV's antenna is located. WTVF (CBS) has their tower located in North Nashville on the same vector as WSMV, and of course I did no better than trying to get WSMV.
Which means as a recent DirecTV customer, I had to sheepishly go back to Comcast and ask to be reconnected to limited basic service. Fortunately they didn't charge me for a re-hookup fee. I decided to allow my Mitsu's built in ATSC tuner to try to pick up the unscrambled QAM channels instead of getting the Moto 5100 cable box they offer for $5 a month.
The good news is that the Mitsu was able to pick up all unscrambled DTV channels that Comcast offers. WSMV, WKRN and WTVF are all available in their HD glory. Unfortunately, the Mitsu has one major annoying problem. NetCommand 3.0 allows the TV to search for all available DTV channels. It successfully does that, but it also picks up every scrambled DTV broadcast channel that Comcast is either using or has the frequency reserved. Of course, the TV can't make any sense of the scrambled channels and just blinks the screen at you. It takes manual intervention to go in and delete all the bad channels from the database. It's really important for a few channels since for some unknown reason, if you tune the TV to them, the TV completely loses its marbles and shuts down.
The only other weird thing is that there are some channels that are being broadcast as SDTV in the proper ATSC format that the Mitsu's tuner picks up. These channels are: the Tennis Channel, the Fine Living channel, ESPNow, the Independant Film channel, NickToo and Nick Gas as well as a Comcast channel explaining the virtues of digital cable. I'm not sure why Comcast is sending these channels in SDTV in the clear, but they are there in case anyone's interested.