I built/will build a Gray Hoverman antenna and I am:
I'm an consumer electronics tech and an avid DXer. I built my SBGH for better DTV reception/better DX as well. I have gotten DTV stations from 200mi away from Louisville KY 2nd floor apt antenna at 25 ft agl. I recently raised it another 5 ft to clear the roof. This antenna works better than anything I've used commercially or home made. It is constructed with 2 1in square tubing for the boom, #8 alum wire, and scrap antenna elements for reflectors w/ 1/2in chicken wire reflector screen.