160 METER VERTICAL

[Chuck Dietz]

tr19@chrysler.com wrote: (snip)
> 
>      A concrete pad is probably sufficient insulation with a low feedpoint
>      impedance.  Use a baseplate on the bottom section.  (Saves lotsa $$$).
>      (WA4CTA found a noticable change in feed impedance of his elevated GP
>      reverse fed antenna when he removed the ground wires from his concrete
>      pad mounted tower, and no change in impedance when it rained.)
> 
>      de Tom - N4KG

I believe concrete is a GOOD conductor of electricity especially when 
wet.  This would explain why the impedence did not change when the 
radials were removed on a rainy day.

Chuck, KE5FI


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