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Both the power supply and the mast-head preamp unit need to be removed when testing the reception without amplification. The amplifier unit does not pass any significant amount of signal when power is disconnected. Most amplifiers will attenuate 20 to 40 dB when power is removed. That a few strong signals can be seen is not uncommon. Signals with NM figures of +50 and higher may leak through the 'dead' amplifier.
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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; 12-Sep-2011 at 3:00 AM.
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