What troubles me more than gaining height is avoiding all the branches. Pull the other end of cord to raise the antenna and it gets caught at every branch. Anyone have a solution for THAT?
Nothing brilliant here, but I've found that when I'm stuck going back a foot or two and then pulling quickly to get over the branch / snag sometimes help.
My normal approach is a rock on lightweight nylon over the branch first. I try to throw nearly vertically so the rock just goes over the branch and falls nearly straight down. If you get too many other branches, your life is hell.
When I have the light string over the branch and hanging on both ends, I tie heavier dacron to one end, and then pull that up and over (that's the snaggiest step).
Once I have the heavier rope over, I tie my antenna center to that and pull that up.
Be sure to have enough heavy rope for THREE tree-heights. If you only have two tree-heights of rope, then when you want to take your antenna down you have to pull on the feedline, which doesn't take as kindly to it as rope does. If you have three, you can pull it down by the hanging rope.