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While the towers are in the same relative location, the signal doesn't always behave the way we want it to. You are likely experiencing what I call "frequency-specific multi-path". That usually means that you are getting an errant reflection off something on or near your line of sight that is interfering with the "primary" signal in a destructive nature.
The solution is to either try a more directional antenna (hoping to reject the reflection) or to move the antenna to a different location (up, down, left right) and try again, hoping that the new location is not bedeviled by the original reflection or a new one.
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