RadioBanter - View Single Post

January 23rd 06, 06:11 PM posted to rec.radio.amateur.antenna

wrote:
Conductive mast?

Sure. Grounded at the base too.

I am somewhat surprised at the effect of a grounded
conductive mast upon the feedpoint impedance predicted
by EZNEC. On 40m, with the radials attached to the mast,
the feedpoint impedance is 7.8 - j255. With the radials
not attached to the mast the feedpoint impedance is
81 - j219. With no radials and using the mast as a
counterpoise, the feedpoint impedance is 2044 + j1461.
--
73, Cecil http://www.qsl.net/w5dxp