Gantry is divided into two kinds, one is a small single pulley bracket, strictly speaking can not be called gantry frame, suitable for the use of fishing rods within 15 meters, take a support rod, there is a pulley and two pulleys at the top of the difference, generally choose a pulley within 12 meters, more than 12 meters try to choose 2 pulley brackets, so that the support part is larger, It's easier to move the fishing rod.