Wor wrote:
I think "beam" i spolitical name. Antenas with directivity was made by
japanese scientists Yagi and Uda. And after WWII Japan was not very popular
between Americans. So, they name such antennas "beam"

Except Yagi and Uda did their work well before WWII.

The term "beam" is nothing more than slang for a directional device.


--
Jim Pennino