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When I used my 102 as a ground plane, I had the whip with no spring and 3 radials.  If I remember right I made the radials longer than 102 inches and had to shorten them for the best swr reading. I was able to get 1 to 1.5 swr across all 40 channels.  It may have been dumb luck, idk? But it worked really well for me.