I've never made one but I've seen them. You take 3 fenceposts and put them in the ground to create the 3 points on a V. Take some fencing material and attach it to the first post wrap it around the bottom of the V and attach it to the other post. Basically you are making a sharp corner out of fenceposts and fence. Pour some corn on the ground in the corner and when a buck feeds in it, his antlers tap against the fence knocking off any loose ones. You can also use more posts and create W's that have 3 corners to put corn in.