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It it's all about that x. If you have x=0 and low swr that's great. However all that can be and you might be shooting straight up to the clouds or straight down the mast to the ground.  I think it's a balance between x and take off. 5/8 should require a groundplane. Have you a ground plane?  And if you put it over a groundplane it will prob mess up the rest of the numbers.


Just my thoughts