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if you haven't seen 0.00J you haven't seen resonance. there's only two ways to proceed, either find the frequency where resonance occurs or change the length of the vertical element to find it. the first method will be easier. we can come back to swr when you find the frequency where (X) reactance = (or most closely approximates) 0.00 ohms. from what i've seen, 5.80 is the closest you've come to it @ 27.200000. resonance hardly if never occurs at a flat 1.0:1 feedline swr. at a low swr yes, not flat.