I found this site for DTV and/or OTA fans.
Lots and lots of technical info on DT broadcast stations; video bitrate and sometimes even audio info.
Go to: Listings/Web Listings for market groupings.
One thing is confirmed: once you leave the "-1" stations and go to the -2, -3 etc channels, the quality goes minimal. Typically 480, rarely 720.
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Topic - DTV info site - cdb 21:18:45 02/23/12 (0)