Best tip/advice is;
1. Don't fall out'a the tree. You or the antenna.
2. Depends on the particular antenna, but run a ground line to the base of the tree and ground it well. Won't do anything for the signal, but'll provide an easier path to ground for lightning etc. (poor tree!).
3. Expect some variation in SWR which will follow the swaying of the tree and the time of year (sap, not you, but in the tree/leaves).
4. Expect to be hated by 'tree huggers'. (Oooo, the biggy!)
5. Fix the feed line to the trunk of the tree. Someone is bound to try pulling on it.
6. Glue a plastic birdhouse around the base of the antenna. If/when neighbors ask, the metal parts sticking out are lightning rods to keep the little cheepers safe. (Helps with the P.E.T.A. idiots.)
Bound to be more tips/advice!
- 'Doc