Imaginary numbers are a mathematical phenomenon. The electrical quantities such as voltage, current, resistance, reactance etc are not imaginary, these are real quantities. However sinusudal wave behaviour fits exactly to imaginary number maths, as well as to vector maths (developed initially as mechanics of forces acting in different directions). Alternating current calculations therefore take advantage of already developed tools of vector maths and imaginary number maths.Just as well some people are determined so they can enlighten us.
My eyes glaze over at the mention of imaginary numbers I've found a couple more videos on Youtube which I'll watch - assuming I stay awake.
In that case I won't make one as my CoCo also out-performs all the other antennas I've made.
Well I experiment to find out the "best antenna". There is always a possibilty to find a new or modified design which is better than the design which is currently the best. Sometimes apparently crazy ideas like Columbus' "Sailing West to reach East", can bring astonishing results.
Story of my best CoCo:
Following process repeated innumerable number of times over a period of 1½ years, till I hit the gold mine:
make > test > throw in garbage