I would try to find an alternative to using a J-pole as the anchor for a 5' or 10' mast. The leverage of the longer mast would put enough torque on the mounting bracket and fasteners that you would expect to see the whole assembly pulled loose from the roof.
If a wall or eve bracket does not work in your situation, consider a tripod such as the VMP TR-60. You get a solid base that spreads the load well and if needed, you can remove one base bracket bolt to tilt the entire assembly over for access to the antenna... while keeping two of the three legs connected to the roof deck.
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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; 24-Aug-2013 at 6:45 AM.
Reason: added link
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