I have made a rotatable 44 feet EDZ at about 50 feet high. I use a ldg
automatic tuner and it tunes on 6,10,12,15,17,20,30,40 and 80 meters. I am
very pleased with the results.

The el. are made from fishings rods and look a bit like a horizontal V form.

As the EDZ has gain on 10 meter would a reflector at 8 feet create more gain
and also FB?

And what would be the effect on the other freq. will I also get some gain
and FB.?

For 10m, you would use TWO reflectors, each slightly more than a half
wavelength, aligned with the currents in the EDZ. It will look like two
2 element yagis side by side. You probably want the spacing closer than
8 feet. You can also place directors in front of the EDZ.

That will only give you gain and FB on 10. You would need other reflectors
for the other bands, for example a single reflector for 20m would work well.

Torsten
N4OGW