"Hasan Schiers" wrote,

I am a bit surprised at the small effect on losses in the number of
radials
once one gets above 8 radials of 20m length.
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Hasan, why should you be surprised? Have you been reading the
plagiarised old-wives tales in the magazines? ;o)

There's another more accurate program, RADIALS2, which may be of
interest, which deals with shallow-buried radials of any length and
number, in conjunction with a simple vertical antenna of variable
height just to illustrate the practical effects.

Download program RADIALS2 from website below.
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Regards from Reg, G4FGQ
For Free Radio Design Software go to
http://www.btinternet.com/~g4fgq.regp
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