I don't know what construction technique you have in mind, but I prefer to
build them from 1/2" copper pipe. If that's what you intend to do, then
just cut the vertical radiator 5/8ths instead of 1/2 lambda. Build the
rest the same (1/4 wave stub). Attach your coax to the stub section using
hose clamps, and tune by sliding the clamps up or down until you achieve
best SWR. Works great.

ac6xg


Should it be that simple? I understood from other posters that it will not
work with the 1/4 wave stub..
Maybe I must try it myself?

What I found is 2x5/8 wave with a 1/4 wave stub.. ?