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Piers have been successfully made from Bolted up timber, old concrete pipes stood on end (mine) girder cut offs, home made tripods of various materials. I even know of a old solid tree stump that is being used as a base.
Bunnings is your friend with big bolts, threaded rods and galvanised hardware that can stand up to the weather.
I started with a braced length of 2" Galvanised water pipe and it worked ok for a small scope.
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