Back in the '60s WLOS had, with its system of translators, a monster signal into six states; it was the de facto ABC affiliate for the Tri Cities before WKPT signed on in 1969; viewers in Knoxville preferred it to their own ABC station, which at the time was WTVK/26, and you could get it in Athens, GA about as well as you could get Atlanta's then-ABC affiliate, now known as WXIA/11 Alive. Channel 13 put a signal into the two Carolinas, Virginia, Tennessee, Kentucky, and Georgia.
Lynchburg's Channel 13, the oldest ABC affiliate south of Washington (WLOS is second), was hamstrung in trying to find a place for its transmitter because of WLOS's superior tower position and also issues about short-spacing WOWK Huntington, WV (which makes no sense to me because Huntington isn't that close to either Lynchburg or Asheville).
September 2 was the 60th anniversary of another ABC station in North Carolina, WTVD/11 Raleigh/Durham, which is an ABC o&o. Unlike WLOS, which has been with ABC from the beginning, WTVD started with NBC (and the first network show it ever carried was one of my favorites, Groucho's "You Bet Your Life"), went to ABC when WRAL signed on in 1956, to CBS (secondary ABC) when WNAO folded in 1958 or therabouts, to CBS (NBC secondary) when WRAL went to ABC in 1962, a move which generated controversy when Ch. 28, the former WNAO, returned to the air as WRDU in 1968 and found itself getting the crumbs tossed to it after TVD got through cherry-picking the strongest CBS and NBC shows. RDU complained to the FCC, which required TVD to pick one network; it chose CBS and stayed there until 1985, when its owner, CapCities, bought ABC, made TVD an o&o, and RAL became the CBS affiliate (NBC moved to WNCN in 1995, first as an o&o and now owned by Media General).
WWAY Wilmington and WCCB Charlotte have 50th anniversaries coming up; 2015 will be the 60th for WITN and for WUNC, one of the first public (then called educational) stations in the country.
Anyway, WLOS has long been one of my favorite ABC stations; I think in the '60s and '70s in particular it modeled itself on Channel 11 in Atlanta and, until WGHP went to Fox, on that station as well. I also knew one of its former employees, Debra Furr Sluder, when I was a kid. Happy birthday, News 13!