The noise you make when rattling antlers together imitates the sound of an ensuing antler battle.
Bucks respond to rattling much more frequently than does do.
It is thought that rattling attracts bucks because they may be attempting to assert their dominance, or possible steal the doe the bucks are fighting for. Rattling is most effective during the rut, and for a few weeks before and after the rut. Rattling is more effective in areas where bucks outnumber does. Rattling works best in open areas on calm days, and is not very effective in high winds or in heavy timber because the sound doesn't get carried very far. Before you attempt to rattle, you need to make sure your stand is downwind of heavy cover where the bucks may be.