Reg, G4FGQ wrote:
"Terman, Kraus, and Balanis and some computer programs are of no help!"

My dictionary defines "field strength" as:
"3. The strength of radio waves at a distance from the transmitting
antenna, usually expressed in microvolts-per-meter. This is not the same
as the strength of a radio signal at the antenna terminals of the
receiver."

The definition looks OK to me. The reason the signal is not the same as
the microvolts-per-meter even when the antenna is a 1-meter length of
wire with just the right slant is because the induced voltage gets
divided between the antenna and its load (the receiver).

Maybe Cecil`s IEEE dictionary has something to say about field strength.

Best regards, Richard Harrison, KB5WZI