Jik, NN7K wrote:
"Does this mean if you stack 2 isotropics, you have a gain array?"

This thread has provided many laughs. I`m sorry to to insert a serious,
on my part, posting, but it may bring a chuckle too.

Terman writes on page 874 of his 1955 edition:
"The spacing of the individual antennas in a broadside array has only a
secondary effect upon the directional characteristics of the array
provided the spacing is not too great. Thus, when the individual
antennas are isotropic radiators, vbarying the spacing from very small
values up to 3 lambda/4 affects only the minor lobe structure, as shown
in Fig. 23-11 b."

Best regards, Richard Harrison, KB5WZI