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Mileage estimates are the product of the sales department. A few reputable companies tend to make conservative estimates. Others make obviously exaggerated claims (150 miles is hard to believe under any circumstance).
The TV Fool data is based on the transmitter power, terrain and other known, relevant facts. Someone 10 miles from a transmitter, blocked by terrain may not be able to get a useable signal with even the largest antenna... You have open, clear terrain between you and the transmitters. Notice the 'LOS' path indication. You have a high noise margin for most all signals that are LOS. You don't need a huge antenna.
Cheers
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