how to get a quadcopter out of a tree

http://hackaday.com/2015/08/03/how-to-rescue-your-quadcopter-from-a-tree/

or, my brother used a tennis ball with a long string attached.

This is the reason you want your name and phone number clearly on your drone, so if you have to leave it, the wind might knock it down later and a good samaritan will call you up.