Owen Duffy wrote:
"Is that correct---?"

No, I don`t think so.

Kraus` formula is:
Radiation resistance = 80 pi squared L squared

L is the fraction of a WL made by a tiny dipole.

For the same wavelength, a monopole is only 0.5 the length of a dipole
and it has 0.5 the radiation resistance.

If we use its length in the formula abbove, the radiation resistance
would calculate as only 1/4 that of a dipole because the constant is the
same and L squared is 0.5 squared.

I speculrte from the resistance ratio of a normal dipole to a normal
monopole that the answer should be 0.5. So I erred by halving the
constant. I should have doubled it to offset the quartered answer an
unchanged constant would produces when L = 0.5.

My new and improved answer to what the value of C is:

1580

Best regards, Richard Harrison, KB5WZI