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With the Channel Master 7777 preamp, would I need to be concerned about overloading my local channels?
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YES, you need to be concerned. Do NOT use that amp. In the event that you find an amp is needed, stick with a medium gain (15-20 dB) amp with high overload tolerance.
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I can't pick up RF12 from the ground floor, either indoors or outside,
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That suggests either an impaired signal path, stronger localized electrical noise at the lower elevation, or a combination of both.