That's why I went with the dipoles instead of yagi's. Stack up three elements on a driven array at 1/4 wave spacing, with each element driven 90 degrees out-of-phase in succession and the f/b ratio is VERY impressive. Another station only 5 miles away transmitting at 100 watts can't be heard on the back side of a three-element driven array. The phase cancellation, once tuned to perfection, is 100%. And the whole thing is only 10 feet long, front to back. But it's 23 feet high once you add two more three element driven arrays at 5/8 wave stacking height to get the azimuth angle down tight.
You can't just turn that array - it has to have azimuth tracking as well. And to get maximum ground gain on the ground plane radials laid out in front it, pointing east, the bottom elements have to be precisely 19.6 feet from ground. So from ground level the whole thing is 43 feet high. I welded an old satellite tracker to the end of a 20 foot long piece of 4" x 11ga pipe and set it in concrete.
Phased all-driven arrays are very hard to tune. I used 75 ohm RG59 for the phasing lines, feed the junction box with open wire parallel feeder, and you find variations in VF on lengths from the same roll of cable. And then you get it perfectly tuned, the temperature goes down, the Velocity Factor goes up and it's out of tune again. In February when we make our first set of attempts for the new year I'm sure I'll be out there in 20 below with the analyzer tuning up spacing on the elements to match the VF of the phasing lines at sub-zero temps.
And all that work for about one minute of glory that there's only about a 10% chance of being successful at.
The other station I'm working with that built the wireframe reflector, and I, are going to try simpler EME, station to station when the moon is a little higher in the sky. I can only tilt my array 30 degrees so even that has a pretty narrow window of opportunity.
But it's still fun, and a nice departure from working HF all the time.
When I go over to Steve's place sometime I'll take a photo of his wireframe reflector he built. It's pretty big, made mostly out of 2/4's for the framework to hold the dish movement. And he made the framwork for the dish itself out of light angle and 3/16" steel rod with several microwave screen reflectors laid in it. It's a pretty impressive antenna, made mostly of parts gotten from Menards, except for the microwave reflector screens which he got salvage off a microwave tower someplace. Took him all summer to build it.