Topband: Modeling "Ground"

[K1FZ-Bruce]

Agree with Tom

I found that the 160 foot BOG antenna that was buried was more  
unstable with dry/rain conditions, than when on/above ground. 

Also the 1/8 wave spaced  160 meter 4 square, I had some years ago, 
was more stable with more radials, with  changing ground moisture 
conditions. 

Single in ground wires are not very stable with moisture changes.  
Larger ground radial fields offer much more stability. 

73
Bruce-K1FZ
www.qsl.net/k1fz/bogantennanotes/index.html
. 

On Mon, 23 Feb 2015 07:58:13 -0500, Tom W8JI <w8ji at w8ji.com> wrote:
> In reality, NEC4 can produce quite accurate results when modeling 
> buried > radial wires and groundwave propagation losses along a real 
> earth path -- > as long as earth conductivity is known for that path 
> and operating > frequency. 
> >
>
> Calculating a good result for one situation, like field strength at a 
> distance for a vertical radiator when gradual attenuation is 
> involved, is worlds different than calculating pattern produced by a 
> long buried wire. _________________
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