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Ray,
I built mine (and a mobile wheeled version as well) from 6" steel tube. On the lower end I welded an 8" square of 4 or 5 mm steel flat. When I poured the concrete in the ground I placed 4 bolts with the threads just sticking out of the concrete. When set I simply bolted the flat and tube onto the concrete and secured it via the 4 galvanised bolts. I kept the concrete a littel lower than the surrounding grass etc, so in the event of a shift I can simply cut/grind off the threads, and take the flat/tube with me. On the top I have used a G-11, a Tak EM200, and now an AP600E, all with some form of adaptor plate.
Simple, cheap, and effective.
Gary
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