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You're assuming precision in the underlying input data that does not exist.
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Correct
The computer simulations for the tvfool report, the Longley-Rice coverage map, and the terrain profile, give the impression of accuracy that exceeds reality. Look how I was fooled by the elevation profile.
I don't expect anything better than a location specified to an accuracy of a football field length or two.
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The Longley-Rice plots from www.rabbitears.info indicate about a 100-foot shift in the reception morphology for WCAX, relative to WPTZ. The shift puts my house right on the edge of a WCAX deadzone.
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Nicely done comparison, but the tuner makes the final decision.
Your tuner will take all factors into consideration that affect signal strength and signal quality (as defined by SNR and uncorrected errors), and tell you if the signal is good enough.
When I aim an antenna, I go for max signal strength, then readjust for max signal quality. They are not always at the same azimuth because of multipath reflections.