"...input to the preamp..." means between the antenna and presumably mast mounted preamp.
ADTech is correct to point out the importance of giving static an easy, reliable path to ground.
Consider adding a DC-block in the coax run, just after the grounding block. It will encourage surges to go to ground through the outdoor surge protector / ground block path rather than through your tuner and then to power ground.
http://www.a1components.com/itemdisplayn.aspx?item=4313
http://www.lightningsafety.com/nlsi_...protection.pdf
http://forum.tvfool.com/showthread.php?t=901
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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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