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21.5 dB forward gain does not seem plausible... I've seen gain figures like that, only on a pair of 8' diameter parabolic antennas ganged together, weighing about 150 lbs. I suspect that that figure may be the Front-to-Back ratio. Radio Shack has never been known to hire the top of the class from MIT's electrical engineering department.
My first thought re. reception is, try the antenna outside, above the roof line.
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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; 4-Jan-2012 at 3:04 AM.
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