[Towertalk] telrex 20m646 feedpoint impeadance

["Joe Barnes" <n4jbk@bellsouth.net>]

I am getting ready to put up a telrex 20m646 (20 meters, 6 elements, 46' boom) 
that I have cleaned up, however I am wanting to put a commercially made balun 
on the beam instead of the 1/2 wave piece of coax used for a balun from the 
factory. Does anyone know the feedpoint impeadance of this antenna? I am trying 
to determine what type of balun I need ( 1:1, 4:1 etc.) . 
Thank you for all input.

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