I can understand the want for NBC HD because NBC has plenty of O&O's esp. in areas that have mountains like San Diego, San Francisco, and Los Angeles or an area with many buildings and problems with the transmitters like New York or Chicago.
However, ABC has so few O&O's in such terrible markets that it would be a waste carrying them on DISH when you could have other channels first.
CBS O&O Stations
KEYE-TV Austin, TX
WJZ-TV Baltimore, MD
WBZ-TV Boston, MA
WBBM-TV Chicago, IL
KTVT-TV Dallas-Fort Worth, TX
KCNC-TV Denver, CO
WWJ-TV Detroit, MI
WFRV-TV Green Bay, WI
WCBS-TV New York, NY
WFOR-TV Miami-Ft. Lauderdale, FL
WCCO-TV Minneapolis, MN
KYW-TV Philadelphia, PA
KDKA-TV Pittsburgh, PA
KUTV-TV Salt Lake City, UT
KPIX-TV San Francisco, CA
KCBS-TV Los Angeles, CA
NBC O&O Stations
WNBC (NBC4 New York)
KNBC (NBC4 Los Angeles)
WMAQ (NBC5 Chicago)
WCAU (NBC10 Philadelphia)
KNTV (NBC3 San Jose/San Fran.)
KXAS (NBC5 Dallas/Fort Worth)
WRC (NBC4 Washington)
WTVJ (NBC6 Miami)
KNSD (NBC7/39 San Diego)
WVIT (NBC30 Hartford)
WNCN (NBC17 Raleigh)
WCMH (NBC4 Columbus)
WVTM (NBC13 Birmingham)
WJAR (NBC10 Providence)
ABC O&O Stations
WABC-TV New York
KABC-TV Los Angeles
WLS-TV Chicago
WPVI-TV Philadelphia
KGO-TV San Francisco
KTRK-TV Houston
WTVD-TV Raleigh-Durham
KFSN-TV Fresno
WJRT-TV Flint
WTVG-TV Toledo