Wind chimes and a scarecrow. Or place a shooting house on the line looking down into the draw right in front of the stand and place flagging tape on every limb going in to the shooting house. Don't put a window on the back side so he can not tell if someone is in there or not. You also might want to put a tent blind down in the hollow as a decoy during bow season with flagging tape to it. I would do it the week before bow season.

"After all, it is not the killing that brings satisfaction; it is the contest of skill and cunning. The true hunter counts his achievement in proportion to the effort involved and the fairness of the sport." Dr. Saxton Pope