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Aluminium does not behave well in concrete (it likes acidic or neutral environment and concrete is very alkaline). Steel pipe is better for permanent setups (it is for ever if nickel plated) and it does not matter if it is heavy. For a permanent site you will want to fill it with concrete anyway.
I was using plastic pipe in the past (filled with concrete and couple of steel rods with threads at the top, to fit the mount) and I was very happy with the setup.
I am planning something like that for my yard in the near future.....
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