"Cecil Moore"
Everywhere it exceeds 2*D^2/lambda in length, where D is the greatest
dimension of the array.

Are you saying that the sources that are "near each other"
are far enough apart to be in each other's far field?
How could that be if the two sources are D apart?
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It isn't necessary for the radiators to be in each other's far field.

Here is a link to a plot of the far-field elevation pattern of a linear
array of three isotropic sources at one lambda vertical spacing.

http://i62.photobucket.com/albums/h8...picSources.gif

RF