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I doubt this is a problem with the antennas especially a Yagi style like the HBU 55. That is designed to get signals in multi path prone areas like yours. Since the troublesome signals are Green (48) and Yellow (35) I would have to say the problem is likely with the terrain between you and the transmitters. It is probable that you happen to be in an isolated spot where the signals just don't penetrate very well.
I've heard about similar problems in the Pittsburgh area. People just a few miles away from the transmitter in an Green signal area having difficulty getting local signals. Hills can play tricks with digital signals. My guess is that this is the problem.
Can you try moving the antenna around on your property? Do a field test by taking it down to ground level and put it 10 feet on a mast and point it in different directions to see what you get.
I think the problem is with the location and not the antennas.
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