Where I live there are many barns made exactly this way.  Pressure
treated 4X4s 4' deep and a 3 bag mix seems to be the standard.  Some of
these barns are huge and many have been up for many many years.  Should
work just fine.
Noel
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See: http://www.mscomputer.com  for "Self Supporting Towers", "Wireless Weather 
Stations", and lot's more.  Call Toll Free, 1-800-333-9041 with any questions 
and ask for Sherman, W2FLA.
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