Richard Harrison wrote:
Cecil Moore, W5DXP wrote:
"Years ago I experimented with two-element beams where both elements
were driven."

J.D. Kraus, inventor of the W8JK beam obviously did too. He found the
most gain he could get is the configuration of the W8JK. . .

The W8JK doesn't provide the most gain of any two element array of half
wavelength elements for a given spacing. At 0.1 wavelength spacing, a
two element array fed with a 166 degree relative phase angle provides
about 1.4 dB greater gain than a W8JK. At 0.25 wavelength spacing, 142
degree phasing gives the highest gain, just over 1 dB greater than a
W8JK. These phasings also provide a higher feedpoint impedance than the
W8JK, which results in decreased conductor loss and easier matching.

The W8JK has some advantages over other two element arrays, but having
the highest gain isn't one of them.

Roy Lewallen, W7EL