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First, I'd inspect the antenna. Manually check each connection. One could be loose. After 14 years the antenna could be fine but the coax could be failing.
If there is a splitter, it could be failing.
If the antenna is physically fine I'd run a single length of new coax direct from the antenna to one television to see if it fixes the problem.
If you need to replace it I'd go with something like an Antennacraft HBU11 or an RCA ANT751.
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