Wet roofing is more conductive than dry. As a result, a wet roof deck reflects and absorbs radio waves differently than the same deck when it's dry. The result is that signal conditions in an attic are far more variable and prone to change than those outside the attic.
Trees and other vegetation are also good at reflecting and absorbing radio waves.
The DB4E + Y5713 is not overkill in your situation. In fact even larger antennas could be used.
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If the well is dry and you don't see rain on the horizon, you'll need to dig the hole deeper. (If the antenna can't get the job done, an amp won't fix it.)
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