Hi, I am working in a vertical for low bands (160, 80 and 40m)...i am using a combination of 1 1/2" OD aluminum tubes to build a 54 ft high vertical. I am looking for UV resistant rope for guying...what is the best diameter 3/16 or 5/16"??? Any idea ???...any website from the US ??? Thanks, 73...Doug, CO8DM