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I use rebar.The bigbox home stores sell it precut.You might get a pair of 3 footers and a pair of 1 footers,Cut about a 3 in chunk off each of the 3 footers for a spacer,
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Weld the one footer and thr three footer together parallel with the spacer between to make a fork.You use them as a pair.Drive them into the ground and stuff a cellotex target board in the tines of the fork.
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