would you expect improved reception from a DBGH10n3 over SB?
Yes, of course.
but it peeves me that there are two peanut whistle UHF stations that I am unable to receive most of the time, 46 miles north in Washington, DC. I am preparing to build another GH10n3 that should be eaiser for most folks to build and hopefully will be lighter than my first.
Since youre going to build another GH10n3 anyway, its worth a shot at ganging it. Height and location experiments on the SBGH10n3 may help, possibly even more than ganging.
Post your TVFool again and name those stations.
It would not be that much harder for me to add a second vertical bay, without the NARODs and their 3 reflectors in the second. My current SBGH10n3 gets the two available VHF stations 24/7 even during widespread thunderstorms. If it is worth a try, am I correct that the two bays could share the same end reflector rod?
Since your not going after additional vhf-hi gain, just more uhf gain, that should be fine. Wider spacing is required ganging for vhf-hi gain.
Would the correct spacing of phasing lines still be about an inch above the active elements and an inch apart?
Im still playing with phasing line design, but 1 inch above and and 2 inches apart is still about the best so far. Experiments with bending in the top to 1 inch, leaving the middle 2 inch spaced, may also be fruitful depending on the channels.
You could also try ganging with two baluns, two equal lengths of coax and a quality splitter used in reverse.
OR this Winegard SD 3700 300 Ohm TV Antenna Outdoor Coupler should be even better with less loss:
http://www.solidsignal.com/pview.as...V-Antenna-Coupler-(SD3700)&c=Signal Combiners
(I dont like what they say "Joining two antennas can be a great alternative to a rotator" because if you point the antennas in different directions, youll lose gain from both. Which if the signals are strong enough, may be OK, but when ganging for max gain, you want both antennas pointing in the same direction.)
Also is the GH10n3 that you built/building have the same uhf dimensions as JEDs GH10 here ?
http://www.jedsoft.org/fun/antennas/dtv/gh.html
If not, which GH10n3 design did you build ? If different, Ill model it without the NARODs and NAROD reflectors to see if any impact on uhf.