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suggests that either diffraction, the local environment
or local sources of interference dominate reception.
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I would wholly agree with that assessment. Pinning it down gets more difficult and usually requires more tools and more patience.
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I think it's time to start moving things around (and down).
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That's usually a good place to start. If you could get your hands on either a spectrum analyzer or the poor guy's equivalent, an SDR setup, it would speed things along tremendously as you could nearly immediately see if there are localized interference sources.