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For some odd reason the FCC Longley-Rice K12LO Coverage Map supports the tvfool report; is it also wrong?
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They are mathematical simulations only.
The information missing from the simulation is the ambient background noise level on the channel of interest which, without a field measurement, can only be estimated. The simulations assume that the noise level is -106.2 dBm, the perfect case. Practical experience has shown that the ambient noise level in the high-VHF band may be anywhere from 5 to 20+ dB higher than the assumption. Subtract that from the calculated noise margin and and you'll see why I'm pessimistic about receiving channel 12.
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Does that site your using tell you where the sweet spot is?
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No. The simulation is dividing the terrain into blocks (pixels, basically) that are anywhere from the size of a third of a football field to the size of several football fields, depending on the resolution chosen to use in the mathematical model.
Try aiming the antenna towards Bigfoot and give it a scan. When reporting results, it's only necessary to name the first channel on a station, listing the sub-channels only clutters up the report with info that doesn't add anything to the technical conversation.