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The article is a very basic and generalized discussion of Yagi antennas and does not address the topic here. I've used that information before to build a number of antennas, as well as info from the antenna elmer site.


The site author appears Dr. Peter Joseph Bevelacqua, who has written his doctorate thesis on optimizing antenna arrays, in where he discusses some theory about increasing signal and reducing interference and noise in the antenna system.


The illustration is that you have on the order of 12 dB reduction in signals from the side and 20 dB from the back, and around 12 dB gain from the front.


http://www.antenna-theory.com/Bevelacqua-Dissertation.pdf