J-Pole Calculator


J-Pole Antenna Calculator

This design utilizes 1/2″ copper and fittings. A typical build will need
1/2″ rigid copper tubing, (1) 1/2″ copper tee, (3) 1/2″ copper caps, and
(1) 1/2″ copper elbow.

A diagram of a J-Pole Antenna can be found below the calculator.

 

MHz   

 

(A) Section Length (Long Section):
 ft
 in
 cm

(B) Section Length (Short Section):
 ft
 in
 cm

(C) Feed Point Location:
 ft
 in
 cm

(D) Spacing Between (A) and (B):
 ft
 in
 cm
(Spacing is inside-inside, not center-center)

SO-239/Coax Center conductor connects to long section (A)
while the shield connects to the short section (B).