The article is a? reprint of the original paper that was published in 1926.??I think the point of the original article was to show discovery of this type of antenna.? ? Of course, the general theory of antennas was not what it would be come yet either in 1926.? ?Today, they would have written the paper, and immediately filed a patent.? ?I didn't see any evidence of a patent from them though.

I found that Kraus does discuss this antenna type on Chapter 11, page 320 as a three element linear array.? He references a later paper by Yagi, but not the original.? ?There is no general theoretical treatment of the antenna type, though he does point to a couple of other references that discuss a single reflector.? He goes into dipoles to a great extent in an earlier chapter,? which is still the driven element for a Yagi.?

73's
Jim? N8CAH