Talking about stake out rebars, here's an idea; use a stakeout chain (chain gang). Tie out a dog and on the other hookup tie a little piece of string and pigeon on the other end. Dog can't reach the bird, the bird can't get away. You'll prolly end up with a funny dog after. Anybody want to try it? Perhaps the dog will go crazy enough trying to reach the bird that it will ignore the noise. Or it will stand there and point.