I should have read this earlier - the top one is definitely a Delhi VHF-HI model (I own an unused one). 30 years ago if it was bought in Ottawa for Ottawa channels that means it is either for 9 or 13 but not both, because those models have steep dropoffs on the adjacent channels so they're not good for the whole VHF-HI band. I wish I could tell the element lengths better but I can't tell from the photo.
As for the other antenna, I mistook it for a VHF communications rig so I'm stumped on it, although the single elements look about the right width for a channel 6 TV antenna, which again makes sense for Ottawa.
OK, let's get things straight here.
1. 7.1(WWNY) and 7.2 (SD relay of 28.1) are both on the same physical channel, so if you can get one you can get the other
2. If the antenna was installed 30 years ago pointed towards Watertown, it was most probably a channel 7 antenna. It's probably similar to one of these
3. Based on your TVFool results, it looks like your net system noise margin for channel 7 with an RS preamp is pretty close to 0 dB. ( = about -3.9 dB(TVFool NM) +12dBi(antenna) -7 dB(guesstimate of RS Noise Figure). I think you'll need 5 to 10 dB of fade margin for reliable operation -- you've got 1 or less. Ken Nist over at http://www.hdtvprimer.com/ANTENNAS/basics.html
doesn't think much of the RS 15-1108. (Note -- the 7dB noise figure quoted above is for UHF channel 30. It's probably worse for VHF ch. 7 -- and your modern tuner probably has a BETTER noise figure than that! Unfortunately, it's masked behind a noisy preamp)
Translating all this geek-speak for a rookie -- your preamp is adding enough noise to the system that your marginal channel 7 is not coming in well enough. Replacing the preamp with something with better specs for channel 7 (a better noise figure -- typically, you can get 3 dB noise figures for VHF with a Channel Master or Winegard preamp) will improve the reliability of the signal.
Re-aiming your antenna might help, but I don't think being 5 degrees off is going to change much.
So the first step would be to get a better preamp -- more stable, and with a better VHF noise figure. Unfortunately, that means you have to climb up there to replace things. The channel 7 VHF antenna looks to be in pretty good shape, and the only way to get more gain for channel 7 would be to add another identical antenna. I think the preamp upgrade is the better route, and they're easier to find! (You can easily
get at least a 3dB improvement with a better preamp, and 3dB is the most
you could hope for from a second antenna.)
I should have read this earlier - the top one is definitely a Delhi VHF-HI model (I own an unused one). 30 years ago if it was bought in Ottawa for Ottawa channels that means it is either for 9 or 13 but not both, because those models have steep dropoffs on the adjacent channels so they're not good for the whole VHF-HI band.
Jon, I don't think so. Thirty years ago channels (4,) 9 and 13 had already been at Camp Fortune for 12 years. CF is only 30 miles away, and TVFool reports NM in the 40dB range. A 10-element yagi would have definitely been overkill for Ottawa stations (at the time, that would have been 4,6,9,13,24,30,40 -- all at Camp Fortune, although I don't think the OP was interested in 9,30,40 en franšais
). And the fact that the yagi is pointed south to Watertown is kind of a dead giveaway.