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Did you try lowering the antenna a few inches as well ? I would try that before going higher, especially if only one channel is problematic. Does the signal level bounce around a lot when on channel 7?
Try to stay at least a foot from the metal cap on the chimney. The cap can have an affect at less than a foot, especially on VHF.
Also, do you have a sound bar or amplified speakers connected to the TV? I have seen them have an affect on VHF channels as well.
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