On wireless.com.pt forum I found very interesting article - there are some em simulations of this famous russian antenna. Interesting is that the auhtor made several test with different number of radiating elements.
This is FA20 original design : Next is with 12 patches :
And finally 16 elements :
Here are results for swr in different simulations :
VSWR 8 Dipoles –> minimum at 2.44ghz 1.46; from 2.4 to 2.5ghz <2.5vswr> minimum at 2.45ghz 1.89; from 2.4 to 2.5ghz <2.8vswr> minimum at 2.44ghz 1.96; from 2.4 to 2.5ghz <3.4
SWR results are not very good
This may be due to a different dimensions used by fable to test this design.
He also used very interesting metod to build and test this design. He used aluminium foil and cardboard.