Bending tube for Mag loop. Simplest way is to get a piece of plywood about 3' to 4' square. Cut an arch of 18" in a 2" x 6" or 2" x 8" and nail it to the plywood. Next cut an another arch from plywood of about 19" or 19 1/2" and nail it to the other arch forming a channel. Use the channel as a bending guide to slowly bring the tube into shape. PJH, N7PXY