Walter Maxwell, W2DU wrote:
"At this height above ground (0.35 wavelength) the dipole is spaced 0.7
wavelength from its image in the perfect ground plane."

I accept that, but cannot reconcile page and figure numbers. I have only
the 1950 and 2003 editions of "Antennas". They are prticeless to me
though I`m not as familiar with them as I am with Terman.

I suggested determining ground resistance by the attenuation it adds to
the ground wave. I neglected to say that the time to do so would be when
sky wave propagation was small to none. Midday when using medium wave
signals for signal strength measurements unless the measurement sites
were close enough to the transmitter to make sky wave unimportant. I
used to make medium wave broadcast station monitoring point field
strength measurements within a few miles from the station, daytime,
nighttime, or anytime because at this short range there is no chance of
sky wave interference. You would be much more considerate of the time of
day 200 miles from the station. If HF signal attenuation versus distance
from the transmitter is used to determine earth resistance, for
practical purposes ground wave propagation is nearly negligible,
especially at the high end of the HF spectrum. I believe B, L, and E.
used 3 MHz which produces some ground wave.

Best regards, Richard Harrison, KB5WZI