|Although I don't recommend shooting in windy condiditons, if you must, guying can be used to stabilize the pole. When working in gusty conditions a good rule of thumb is to guy when extending above 30.|
By design, the poles I build have a natural bow on the cable side above 40'.
This bow serves as a virtual guy and is perfect for 2 line guying forward.
Guy lines can be attached just under the cradle, but the best location is at or below the top pulley bracket.
I use 200# braided dacron for guy line. It's plenty strong and has very little stretch in 50'.