I use a grunt and also rattle.
At one time Wal Mart sold a lure that was about like a McDonald's hamburger box. It contained a couple of D-cell batteries, and had wick on the outside with a loop of wire in it. You strapped it to a tree, opened a bottle of deer lure, put the wick in the bottle, hooked up the batteries, and took your stand. This thing brought bucks during rut like crazy -- but for some reason they don't sell it anymore.
I have put this thing up while a buck was stomping and wheezing in the dark at me. I sat down in the downed top of an old tree, with just enough branches to break up my silhouette, and waited a while, then started grunting and rattling at dawn. About five minutes later, here he came.