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A few possibilities...
1) A bad connection between the coax and connector(s). (Moving the cable can change the tension between the cable and connector so that a poor connection improves or gets worse.) Poor connections make the coax into an unintended antenna which will leak desired signal and can pick up interference and multipath.
2) RF interference is being generated in the home (often there are several sources and moving the coax may change the way the whole system is affected). If the coax is properly installed with no loose or intermittent connections, very little interference can penetrate the shield. The antenna is the 'wide open' entry point for signals and interference... move the antenna outside the attic, at least as a test. Outside the attic, the antenna will have access to stronger, higher quality signal while at the same time be further from sources of interference in the house.
Please resist the temptation to fix this with an amplifier. Reliable reception starts with the antenna, it's location and aim. Once you have a reliable signal at the antenna, an amplifier may be needed to 'push' the signal through the normal losses in your cable and splitter. An amplifier can not do the antennas job.
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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-2013 at 7:34 PM.
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