If you look at the TVFool report those are all in Yellow or Green, presuming you want the 4 major OTA networks, plus PBS. With them in those bands, at the bottom of the report it says that an attic antenna is probably needed, vs a set top box.
With that said, are there any unusual building materials or object in the direction of the main towers? Metal roof, foil backed roofing material, large concrete building next door?
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