I am planning on putting up about a half dozen gravity lines up in a woods I have permission to go in. I understand that when running gravity lines, the straighter the better, my question is, if I have a tree say 10 feet away from my main line, will it work to run line from the tree to the mainline? (the extra long drop line will have no sag in it) How mush dose a guide wire help when running mainlines? (mainline will be 5/16" tubing) Thanks!