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You're describing atmospheric ducting, 'skip'. A phenomena resulting from layers of the atmosphere becoming ionized (electrically charged). When the conditions are right, the atmosphere can act as a duct or pipe, making a temporary path for radio waves over quite a distance.
Many TV sets and tuners don't allow you to manually tune, making it difficult to 'hunt' for weak signals. Now that your tuner has 'seen' them it is letting you tune to them... even if the signal is too weak to be reliable.
I hope you have taken reasonable precautions regarding grounding... it sounds like thunder storms may be common in your area. A properly grounded system would be far more likey to survive a nearby lightning strike than a one not properly grounded.
As JC has suggested, it would be interesting to see your TVFR.
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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; 7-Aug-2011 at 5:20 AM.
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