I use a rope. Actually it is a line from our sailboat which was destroyed. I throw the line over the sign and then the other end of the line over the over side of the sign and then with the line in a U-shape and in back of the sign, between the back of the sign and the wood pole, I pull (be careful not to hit your head with the line or sign, and I wear my glasses while I perform this feat).
I also use a 3 foot crow bar for signs that I can reach.
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C.