Roy Lewallen, W7EL wrote:
"Yes, but the amount extracted by one element is affected by the
presence of the others. So adding or moving an element changes the
amount extracted by all the other elements."

Thank you. Mutual impedance can add or subtract from a total. I assumed
the designer would be deliberately combining elements in such a way as
to maximize total gain. Plans don`t always work the way we hope.

Best regards, Richard Harrison, KB5WZI