folded

Hi guys, I just got a UHF-DP-ARRAY-4/h antenna (Products) and plan on using it on a UHF DMR repeater. It will be side mounted on a large tower and I want to obtain the widest radius of radiation. While the "Spacing from mast" is easy to calculate (1/2WL, 1/4WL and 3/8WL @ freq.), I am not sure...