Frank's wrote:

I can send you a JPEG of an NEC graphic. It is only 9 kB. The array
looks like two stacked 3 element yagis, with only the upper array
driven. I deleted the lower array, and it only made a slight
difference to the performance.

Sure doesn't look like stacked Yagis to me. No two elements are at the
same height. Or are we talking about the same model?

Roy Lewallen, W7EL