The station maybe going through power issues, or the antenna maybe be suss. Other factors like terrain can have an affect including digital.
For antenna, I used to install them a while back I found the lower the freq(channel) the worse it is affected by corrosion too. Channel 2 is always an issue for me. Antenna for TV are a compromise and are tuned usually for the middle reception channel 9 or 10, so other channels are affected.
Mind this was years ago when I installed antennas.
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