It is a lightweight attachment for your bow meant for spot stalking on the ground. You are correct OldTimer...it wouldn't make much sense to use it in a tree! They have some really cool videos on the Heads Up Decoy website! One whitetail gets to about 2 yds of the camera man and shooter and nearly tramples the guy! Sounds like the ULTIMATE HUNTING RUSH to me! Call me dumb, but how many people can say they almost/did get into a fight with a deer or shot one from 5 or less yds from the ground! Haha!