Thank you for your answers.
Regarding the trees in the immediate area - they are all older growth (25years+) so there has been no real change in the past year.
Grounding: both the coax and the antenna are grounded with copper as described, the coax to a grounding block, and the antenna directly to a copper rod in the ground.
I ran the channel setup (on Antenna- Air setting) again, and now have Channel 8 in nice and clear. So it is only Channels 11 and 46 (WXIA/NBC and WGCL/CBS) that are an issue. Forgive me please for being relatively antenna-unsavvy, but do you mean that the Channel 57/IND is so strong that it is blocking 11 & 46? Why would it not block the others? Would I possibly still see that 'Signal is too weak' error message, just because the TV doesn't have any other message to give?
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