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Some one needs to invent a device, like a meter, that would allow you to check your potential signals and signal strength from your home, before you purchase an antenna.
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That would be a good idea. The tvfool report is a computer simulation that predicts signal strengths accurate to about a football field length for location. The report does not take into consideration trees or other buildings in the signal path.
The best you can do would be to set up a smaller temporary antenna and use a TV or converter box that has a signal strength meter. If it looks promising, you could go for the big antenna. You could buy a signal level meter, but it would be cheaper to have an antenna installer make some measurements for you to tell you what your chances are. You happen to be in one of the better signal areas in Harrison.
A generic report for Harrison shows KSPR a lot weaker, -6.3 dB NM instead of +14.6 dB NM, a difference of 20.9 dB.
Generic report for Harrison, intersection of Stephenson Ave and Main St, 36.229794, -93.107677
The elevation there is 1050 feet, 200 feet lower than your location @ 1250 feet.
http://www.tvfool.com/?option=com_wr...e2cbec83046e47
Some people even run a tvfool report before they purchase a home.