Welcome, Bob
Is the coax grounded to the house electrical system ground using a grounding block?
Ordinarily, a grounding block is not required for an indoor antenna, but strong signals can buypass any filters and directly enter the TV cabinet if the coax isn't grounded.
What does your TVFool signal report look like?
It could be FM interference to VHF. What does your FM Fool signal report look like?
Is the channel WBRA?
Loss of the pilot can be caused by multipath reflections.
This signal will not lock because of too many errors (high BER) even though it is fairly strong; -12.7 dBmV = 47.3 dBµV.
A 58 dBµV signal is strong. Are you using an amp?