I ran across two interesting articles by Doug Lung on the TV Technology web site, on the Gen 1 Gray-Hoverman antenna.

Doug's first article was based on the GH GPLv3 design information and he provided links to the digitalhome GPLv3 web site.
His second article shows some builds made by some of his readers and the build by Robert Lynch, assistant chief engineer at the Fox affiliate in Roanoke, Va., has a very interesting reflector-screen variation, that others might want to try.

Here are the links:

http://www.tvtechnology.com/article/68436

http://www.tvtechnology.com/article/68820

These are both from the second article. I loved this quote from a guy who actually worked for Doyt Hoverman. It makes me feel like the original designer just gave all of us a big thumbs up from the big testing range in the sky. :)Ray Tanner, chief engineer at WOHL-WLQP-WLMO-WFND-TV in Lima, Ohio, wrote to say he worked for Doyt Hoverman in 1964 repairing TV sets in his TV store, after he made the antennas. Ray said the original Hoverman antennas had yellow insulators, while the ones made and sold by AntennaCraft had black plastic insulators.

Ray said, "Also, Doyt said that his antenna used only one wire per side versus five per side for the four x antenna. This resulted in less corrosive damage to the connections."And I really enjoy it when another expert discovers the strength of the G-H :)Robert Lynch, assistant chief engineer at the Fox affiliate in Roanoke, Va., built a G-H antenna with a screen reflector (Fig. 3) and says, "I have built everything from Yagis to discones to single bay bow-ties, and stacked and phased bow-ties with and without reflectors. I have also built stacked and phased dipoles, also with and without reflectors. I thought I had tried most all practical UHF antenna types; that is until I saw your article on the Gray-Hoverman design. I built one based on the specs given with exception to the reflectors, and I must say that this antenna kicks butt!" He said, "The antenna in the pictures is the best performer of all of the UHF antennas I use, be they home-brew or store-bought. I can turn this antenna 180 degrees from the transmitters and do a channel scan and not one digital channel is detected."If anyone can drop in to see Robert Lynch or can give him a call please let him know how welcome he would be here.

and the build by Robert Lynch, assistant chief engineer at the Fox affiliate in Roanoke, Va., has a very interesting reflector-screen variation,

Except as you may have noticed, hes missing out on the additional gain that the split screen cut would provide.

I wonder what Tomas Colon is using inside of that pvc co-linear pair reflector. 1/2 inch metal EMT maybe ?

From the second article:The reflector edges are angled in at about 25 to 30 degrees making a kind of square frying pan shape in hopes of attenuating any RF from the sides, as this seems to give it a narrower beam width.I've zoomed Robert Lynch's photo for greater detail of the beveled screen:

http://www.user.dccnet.com/jonleblanc/images/lynch-zoom.jpg

300ohm, would having one of his beveled reflector-screens cut into 2 with the split be sensible?

300ohm, would having one of his beveled reflector-screens cut into 2 with the split be sensible?

From the way he built it, no. But he could have built the beveled pan reflector in two half sections though, and joined them with plexiglass etc.
On the other hand, hes using 1/4 inch mesh, which while increasing his wind load dramatically, offsets say using a split screen 2 X 4 mesh. It sounds like his main goal may have been to get a dramatic front to back ratio. (which after February, should be less of requirement from interfering channels)