I used half-cinder blocks, filled with concrete as a footing structure for the sculpture. Since the ant will be placed in a garden/flower bed environment, I needed something that could be buried and hidden, but still able to 'lock' onto the sculpture.
And here's a close up of those ant shoes. Believe it or not, the giant ant is only a size 8! (...of course I'm not sure how that translates when there are six of them)