Maybe you are experiencing some type of electrical interference that is affecting channel 13. Some culprits include LED bulbs and switching type power supplies. A friend had an outdoor LED floodlight that wiped out VHF when it switched on. Another had LED undercabinet lights in the kitchen with a noisy power supply that caused a problem.
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Antennacraft Y10-7-13 VHF, Antennas Direct 91XG UHF
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