Another idea we are working on is using laser cut plywood mounted to a rod that will go into a weighted coffee can base.

The metal base could be painted or powder coated, and filled with rocks, sand, concrete, or something to hold it firm.
We are considering putting a spring somewhere to allow the finger a little motion in the wind.

The original sign, on the left, has 40" legs. The middle two signs have 32" legs in order to allow 3 legs to be cut from an 8' board.
The pointing finger is 23", the same width as the other 3 signs.