[Antennas] Half wave vertical question

[Richard Brunner]

The end of a half wave antenna is a voltage maxima, and impedance will be 
"about" 4000 Ohms.  Matching with a toroid will be difficult to impossible. 
I suggest a quarter wave of open-wire line connected directly to 50 Ohm coax 
to the shack.  At the antenna end one wire goes to the antenna, and the 
other is floating.  With a half-wave antenna you don't need a ground grid, 
but it will do no harm.  (Other advice will undoubtedly differ...)  You can 
also use a resonant tank, link coupled, or an L network.

Richard Brunner, AA1P

----- Original Message ----- 

>I have read that the impedance of a half wave vertical CAN be several
> thousand ohms. My question is how many thousands. The feed point will be 
> approx.  6
> inches above ground at my location. I have 6 quarter wave radials in 
> place. I
> am trying to match this antenna to a TinEar receiver that I recently 
> built. It
> requires a 50 ohm input. I would like to wind a toroidal transformer to 
> match
> these two, but don't know the ratio I will need. Any help would be
> appreciated.  Rick