Reg, G4FGQ wrote:
"Just a number please."

Given 1 volt per m as the field strength, and a 1-m antenna parallel to
the electric vector of the wave, the open-circuit voltage at the end of
the wire is 1 volt. The best you can get across the receiver input is
0.5 volt when there is a conjugate match between the receiver and the
antennna.

Most of the explanations are irrelevant when the field strength is
specified at the antenna.

Terman preached scientific gospel. He had proof to back what he said. In
Terman`s 1943 "Radio Engineers` Handbook" he wrote:

"The strength of a radio wave is expressed in terms of the voltage
stress produced in space by the electric field of the wave, and is
usually expressed in either millivolts or microvolts stress per meter.
The stress expressed this way is exactly the same voltage that the
magnetic flux of the wave induces in a conductor one meter long when rhe
wave sweeps across the conductor with the velocity of light." This is
found on page 770.

There is no qualification or equivocation. Terman also posts the same
statement with no change in substance on page 2 of his 1955 edition of
"Electronic and Radio Engineerinng". It means what it plainly says.

Best regards, Richard Harrison, KB5WZI