We are going to make the 50 ohm variant, b= 3822mm and a= 1910mm.
It’s a bigger antenna but good results, about 2 dB more gain then a dipole.
And in spite how it looks, horizontal polarization.
It could be build like a quad or a moxon with fishing rods. Wire 1,5mm, sizes:
Total length wire: 11.464mm
1= 1910mm
2= 3822mm
3= 1910mm
4= 3822mm
Above the 50Ohms direct fed SWR plot
10 dBI gain when the bottom of the antenna is placed 10 meters above average ground.