This isn't a problem with the websites mentioned (they are correct in this regard), it's a matter of trying to get reception indoors from 60 miles away with a small UHF antenna. Antenna point is strictly for what its name implies, it does not attempt to signal analysis. Antennaweb uses the same type of algorithm as does TVFool, but with a coarser terrain database and with very conservative and simplified recommendations. Each tool has its purpose and trying to make one do the work of another isn't a productive use of time.
Frankly, you're out of range for reliable reception for your circumstances. Only a much larger outdoor antenna with a proper pre-amplifier is likely to provide stable reception on the ast side of Athem. If you are restricted to indoors only, it's likely never going to work well. The best you can do will be to place the antenna in an upstairs window that faces Atlanta. Upgrading to the C4 isn't a bad idea, it just might not be enough to make it work.
For a discussion of day vs night reception, please refer to this post:
http://forum.tvfool.com/showpost.php...0&postcount=11