Trimming the vertical element of a quarter wave antenna to match 50ohms using a VSWR meter as an indicator is a fallacy. All you have done is make the antenna a complex impedance (R + Xl or Xc) which to the "resistive only" VSWR indicator "looks" like 50ohms. In fact it is the resultant of the real and imaginary impedances. A true quarter wave antenna over a perfectly conducting infinite sheet is going to show 72ohms.
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