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how much is the radiation increased in the upper %15 of the antenna ? more is more , but how much more ? from my own experience increasing power %100 or decreasing %50 didnt seem to effect my contact success . if %100 more signal/power (?) on a full length 1/4 wave vertical (speaker wire and pvc) didn't have much effect , how much more radiation does the upper %15 of the coil loaded antenna to achieve a detectable signal difference ?