Verify the mounting/bracing of the pipe. If it's solidly held in place, so that the roof jack AKA weather boot will not be flexed or stressed, then yes, metal vent pipe can be a decent mounting point.
If the pipe can be moved, even slightly, a leak can develop between the pipe and boot. In that case, you'd be better off using a tripod with penetrating fasteners.
http://www.3starinc.com/pole_to_pole_mounts.html
http://www.3starinc.com/roof_mounts.html
http://www.3starinc.com/tripod_mounts.html
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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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