You want the rope to be as close to the trunk as possible, wider angled branches are more securely attached than ones that grow at a sharp angle. There are two types of branches, those that are formed as the tree grows, strong depending the angle, and those that are waterspouts, first start out as small suckers, but can continue growing. It is these that are dangerous because they are only attached to the outside of the tree, the others come from the center of the tree. Double trouble if these weaker branches grow at a sharp angle. In the past I’ve pulled on these to climb up a tree and have them pull completely out. Wedging your foot in a sharp angle branch can also cause it to fail. So be careful, tree workers will try to get the rope over multiple branches when tying off at the base of the tree if they are smaller.