"Walter Maxwell" wrote
The graphs reporting BLE's measurements are pretty conclusive. In
addition, the
BLE paper is the basis on which the FCC set the requirements for the
ground
systems on all AM BC stations since 1939

==========================================

Walt, where've you been lately?

I have no doubt that BLE measurements are good and valid at LF and
below. But to extrapolate conclusions up to HF, where amateurs reside,
and where funny things happen to radials, is somewhat dangerous.

I understand BLE forgot to measure ground resistivity and permittivity
of the site. Perhaps because they thought it didn't matter very much.
But such things certainly matter above about 3.5 MHz. At HF radials
behave very differently from behaviour at LF if only because the
ground 'constants' have changed from their DC and LF values (which are
the values usually inserted in HF computer programs.)
----
Reg.