Reg, G4FGQ wrote:
"There`s no need to do a conjugate match just to measure voltage."

True. But, it`s best to measure current and calculate voltage because
voltmeter leads are susceptible to induced voltages.

One benefit of the conjugate match is elimination of a reactive obstacle
to current, but because source and load resistances are equal, exactly
one half of the voltage induced in the antenna appears across the
receiver. An infinite ipedance does not load a source at all.

Reg`s question of how much voltage is induced in 1 m of wire in a field
of 1 V/m is answered clearly by Terman in publications which date back
at least to 1932, the earliest copyright date I saw on "Radio
Engineering". So, many competent and critical reviewers have pored over
Terman`s works that it`s almost certain that any errors have been found
and corrected long ago. Everybody makes mistakes, but now Terman is as
close to infallible on the subject of radio as any author I know. Read
page 2 of Terman`s "Electronnic and Radio Engineering" (1955 edition)
for complete details. The same information appears in some other Terman
authored and edited writings (almost word for word).

Best regards, Richard Harrison, KB5WZI