J-Pole CALCULATOR


Enter Antenna Operating Frequency

    Freq MHz

A (Long section) dimension is:    feet,        inches,        meters

B (Short section) dimension is:    feet,        inches,        meters

C (Feed point) dimension is:         feet,        inches,        meters

D (Spacing) dimension is:             feet,        inches,        meters

NOTE: Coax center conductor attaches to the Long section feed point. Shield attaches to the short section feed point.
Inside (spacing) dimensions are metal to metal measurements, NOT center to center. Use 1/2" rigid copper pipe and end plugs.