RE: Drag scent on a line or put it in a tree?
Do all of the above, JRS. Dragging the scent to your stand could lead a buck to your stand using the same path that you took. The scent that you hang around your stand could draw them from anywhere, depending on which way the wind is blowing.
Use the grunt tube and the rattling antlers in conjunction with one another. Most people say that a combination of the two is better anyway.
Good luck.