I am trying to avoid paying $1k for a whisker pole and am looking into making one. It would not be adjustable and I would store it on the front of my mast. West Marine adviser recommends a pole should be 1.5 times the foot of the genny, which in my case would make the pole well over 20 feet, which seems a bit long to me. Those of you with whisker poles, how long do you think they need to be?