Sounds stupid (perhaps there is a more awesome name)but we started it two years ago and its been a very positive addition to the bag of calling tricks. Deer don't fight up I trees. Sparring or fighting should include hoof pounding and leaf rustle at ground level for realism. Rattling with a real set of large antlers is a two handed activity meaning you don't have ahold of your bow and if deer are close you have to go through the motion of putting away the antlers and picking up your bow. Dangle rattling is a one handed activity and you don't have to put anything away, simply ley go of the rope (which is tethered to the tree your in.) The dangle rope is used to wrap the two antlers together for transport. Just another way to go about it.