I would start with the usual suspects. Have any nearby trees grown
sufficiently to block the signals? Did you have any recent storms which
may have inundated the antenna or other equipment with water???
How old is your equipment? Do you have a signal meter on your TV?
You may wish to see and list what your signal levels are on each channel.
Is your system grounded? Did you lose your ground???
These would be a good place to start.
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