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The attic is the easiest target to throw stones at... The impact of flashings, gutters, pipes, metal truss ties & hangers, and even damp roofing materials will all have differing affects depending on frequency. The same is true of objects outside the home, though the further they are from the antenna, the less affect they would have.
There can also be sources of interference that affect only one channel...
Again, testing outdoors would be the next indicated step.
If that's a non-starter, and if cost is no object, try throwing a bigger antenna at the problem.
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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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Last edited by GroundUrMast; 18-Nov-2013 at 5:22 AM.
Reason: sp.
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