Visually survey your property and find out exactly where your right to put up antennas and your neighbor's right to tear them down ends. This sets your limits. If there is an XYL involved, the available space may be artificially restricted even further. If you are fortunate, you may have a neighbor who will permit you to use one of his trees to support an end of your antenna. Unfort-unately, most neighborhoods seem to want an unobstructed view of utility poles, power lines and other people's houses, so they cut down most of the trees.
Trees are frustrating.
Using trees for antenna supports is a double edged sword. At their very best, trees are frustrating. On a calm day, with your antenna strung from the very top limbs of a couple of well placed, very tall trees, trees are wonderful. However, when our kindly old tree and wind and storms get together to do a little mischief, the combination is a real beast. Treetops whip around and two trees never move in the same direction.