Obstructions in link planner

what are others doing to see what is in the link path as far as trees or other obstructions and how do you add these to the planner. 

We have a Knowledge Base article which guides you through adding obstructions to the Path Profile, see How to add obstructions and edit Path Profiles. In the LINKPlanner User Guide there is also a section on Profiles under Using LINKPlanner which gives further information on how to verify end points and high points, with some examples.