They've shown that with about 100 radials of 0.4 lamba length the
result is
almost perfect ground, regardless of the ground conditions beneath
the radials.

I contend that using the radial setup as described above will always
result in a
near-perfect ground at any HF frequency, with close to 100 percent
efficiency.

Would you not agree?

Walt, W2DU
======================================

My dear Walt,

I haver never disagreed.

How can one disagree with a statement of the bleeding obvious?

Indeed, my program RADIAL3 confirms it.

And so will NEC4 if you will allow it time to generate some results.
-----
Reg, G4FGQ.