Art, KB9MZ wrote:
"I looked through the ARRL book and I cannot find any antenna let alone
the two element phased array that showed zero radiation to the rear of
the feed point."

I was quoting the patterns in Kraus` 1950 edition of "Antennas" on page
294.

However, there is a measured by D.C. Cleckner of Ohio State University
pattern of a 3-element Yagi-Uda with more than 7 dB gain and almost zero
radiation in the direction of 180-degrees from the maximum. It is on
page 246. This has 0.1-wavelength spacing between elements.

Best regards, Richard Harrison, KB5WZI