A J-pole commonly used as a small satellite dish mount provides inadequate support for antennas such as those recommended in previous posts. A strong wind would put you at risk of damage to your roof and antenna system. Even those J-poles with bracing are at best, marginal. The typical J-pole is also too short to allow reasonable clearance from many sloped roofs, that is, many large antennas would contact the roof as it slopes upward.
The Ronard brand products suggested by Electron are more appropriate for supporting large antennas.
3starinc.com and
solidsignal.com offer similar products also.
I would recommend that you consider the warnings provided by the antenna manufactures. For example, Winegard's
Instruction sheet shipped with the HD7084P antenna includes the warning,
Quote:
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WARNING
INSTALLATION OF THIS ANTENNA NEAR POWER LINES IS DANGEROUS.
FOR YOUR SAFETY, FOLLOW THE INSTALLATION INSTRUCTIONS.
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I would make an effort to mount the antenna in a location and in such a way that if it fell during a storm, it would be unable to land on or near any utility lines.