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Old 6-Jun-2018, 12:32 AM   #2
ADTech
Antennas Direct Tech Supp
 
Join Date: Jan 2010
Posts: 2,942
Multiple possibilities:


1. Unfortunate antenna location (dead spot or reflection that affects that particular channel only). Move the antenna and retest.


2. Interference from localized electrical noise, very common on VHF frequencies. Move antenna and retest.


If you're effectively married to that spot on the chimney, you'll probably have to experiment with a larger antenna that has more directivity on channel 13.
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