[Antennas] RE: J POLE QUESTION

[Pat W]

 THe Jpole is just a vertical Zepp antenna.  If one
looks in the Antenna book for the classical Zepp, just
make the horizontal 1/2 wavelength vertical and it
becomes a Jpole.

 The bottom 1/4 wave section will cancel the field
providing balanced currents are on the wires, then,
only the top 1/2 wave will radiate omni directional.

 If the currents are not balanced then the Jpole will
not resonate!  I suspect that the 1/4 wave section acts
like a current balun by itself.  Anyone have experience
with not being able to resonate a Jpole until they
added a balun ? 
    
  Pat W0OPW

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