Topband: Modeling "Ground"

[Tom W8JI]

> 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.