It looks like the WSMV signal grazes the terrain just before reaching your antenna. Any trees or buildings would affect it; the tvfool report doesn't take them into consideration.
That hill doesn't do any good for the signal:
The WSMV transmitter is in a different location than the other channels listed in green.
I wonder how many people are trying to use a UHF antenna for NBC.
There is a strong local FM transmitter that might interfere with reception of VHF-High channels.
http://www.fmfool.com/modeling/tmp/3...a/Radar-FM.png
If anyone is trying to use a preamp to receive NBC, the tuner will probably be overloaded by the first four channels on the tvfool report.