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I agree with what John said. If the signal is weak for whatever reason, the result will be those "boxes". This will happen regardless of the brand of digital TV you have. There is already an antenna booster in the Montana, so it is doubtful that additional amplification will help. Slight rotation of the antenna may help if there is sufficient signal strength available, but otherwise without moving closer to the signal source, it is unlikely that you will be able to correct the problem without a "higher gain" antenna or a taller antenna or moving that huge motorhome that is blocking the signal. (Just kidding about the motorhome).
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