For most of the past century the intractability of the equations was the
excuse for just laying down "textbook" overkill radial systems. If you
can't solve the "real world problem", then just change the real world to
match the problem you can solve!!!
NEC4 produces accurate answers for monopole radiators _not_ using "overkill"
radial systems, as long as the NEC model describes the real world conditions
for that system.
The biggest issue is accurate knowledge of the conductivity of the earth in
which the radials are buried, and of the earth along which the radiation
propagates.
The graphics linked below show some of the results possible when using
NEC4.2 ...
http://s20.postimg.org/za26fdc6l/10m_Vert32_Buried_Radials_1.jpg
http://s20.postimg.org/786lgbyb1/160m_Monopole_Systems.jpg
http://s20.postimg.org/oc0p6nkrx/Monopole_System_Params.jpg
R. Fry
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