Quick answer: The antenna is like a tube, and the energy stuff is like liquid that sloshes back and forth in the tube generating a kind of wiggle. This Canadia

Quick answer: The antenna is like a tube, and the energy stuff is like liquid that sloshes back and forth in the tube generating a kind of wiggle. This Canadian military video should help: https://www.youtube.com/watch?v=-F7KYLO4Bkg https://www.youtube.com/watch?v=-F7KYLO4Bkg