Start by checking the basics:
1. Is the coax in good shape? Are all the connections tight? Trace from antenna to tv and check every connection.
2. Is there a splitter in use? What condition is it in? You might bypass it and run a length of coax directly to one TV as a test.
3. Inspect the antenna. The balun might have corroded connections or might be bad. It it aimed roughly southeast? Sometimes they can turn in a storm.
4. What kind of antenna is it? Your stations are all UHF except for one (WOFT). You might post a photo for the experts to look at and comment.
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