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I'd especially appreciate suggestions for removing the issue
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I'd recommend simply 1) moving the antenna so it's not right on the metal gutter and 2) move it so it isn't staring point blank into a tree. Both are commonly encountered but less obvious installation errors.
Proximity to large metal surface causes interference with anticipated antenna patterns and can, if the proximity is just wrong, act as a trap for a specific frequency.
Trees can cause unpredictable results and can cause dead spots for specific frequencies for a very specific location in the spatial environment behind the tree. With UHF wavelengths, moving the antenna by as little as 6" can move a receiving antenna either into or out of these highly localized dead zones. FWIW, I'm going to blame it on the tree until any other factor surfaces.
You do not need a different antenna, you just need to use the one you have more effectively.
