How do you get the rope down? How about attaching to the bumper of
your car and slowly driving away from the tree? Pad the 'edges' of
the bumper, they like to 'eat' rope. Hope the rope is weaker than the
tree.
Was on the receiving end of a piece of 30-40 foot nylon cord I was
trying to get off of a lamp post. You might be surprised at what that
stuff will feel like when it snaps and hits you. Took a few days, but
the welts finally disappeared. The memory will last forever!
- 'Doc

PS - Having a hardware store hanging from a tree is a sure sign of a
dedicated ham! Sort of a huge wind-chime, right?