I think WLOS is moving and won't have quite that good a signal.WLOS was the default ABC affiliate for the Tri-Cities market before WKPT started up, and as you note, for many Knoxville-market viewers, it was their de facto default ABC affiliate as well, due to problems getting a good picture on WTVK.
In Kentucky, WLOS was on cable as far north as Manchester, Corbin, and London. Don't know how much, if any, viewership WLOS has in Kentucky anymore, but it wasn't a long, long time ago that I saw reference made to them on the WTVQ website as an ABC affiliate some viewers might receive (don't recall the context, may have been some thing about the digital transition, they mentioned WCHS as well). Keep in mind that WLOS was the only ABC affiliate on VHF in a very large area stretching from Cincinnati (yes, Cincinnati) and Huntington in the north, down to Chattanooga (not so far) and Augusta GA in the south, and they had the mother of all catbird seats (unless you count Mount Washington) up on Mount Pisgah. Their tower is actually kind of short and stubby, a taller tower would neither be necessary nor probably even allowed.
No one mentioned Charlotte but I watched WLOS when I lived just to the west in the 70s. That's where I watched "I Love Lucy".

