Simple Dual Band 20m/40m Vertical

[cybersean3000]

Has anyone ever build one of these?  The details of the coil and the 40m element seem to be missing from the video.  Is it really this simple?

https://youtu.be/_TDK9ksbAes
 

[gil]

Hello, I bet you could make a half-wave one by doubling the wire lengths... Like my
PAR 10/20/40... Using a 49:1 or 64:1 transformer of course..

Gil.