[TowerTalk] Base equivalent

[Mike Reublin NF4L <nf4l@comcast.net>]

The specs for my crank up call for a hole 4x4x7.5 feet. That works out to 4.4 
yds of concrete. The smaller backhoes that I can get to the site can go to a 
depth of 6 feet. Because of the water table, I consider it an unacceptable risk 
to put a man in the hole to dig out to 7.5 feet deep.

A hole 5x5x6 is 5.5 yds.

Would that be a safe equivalent to hold the tower up with the same wind load?
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