I did try to find the “sweet spot” as you suggested. Was hoping to see WCAX 3.1 pop in. I suspect in this case that even if I got Camp Fortune into a deeper null, the angle was such that the CM 4228HD’s narrow beam width caused me to lose too much forward gain on the side of the frontal lobe. I’m going to try again next time I’m down to Cornwall but it looks like CBOFT 9.1 may just be too strong vis a vis 3.1 at this location. I have a friend in Hawkesbury who is in exactly the same situation vis a vis 9.1/3.1 on RF 22. He was getting WCAX 3.1 just fine when it was on RF 53 before the February switchover.
Well, at least you tried. I'm pretty sure the front lobe of the CM4228 drops off more slowly than the rear nulls, but obviously not enough, or not in the right places.
In any case, your mother may be in luck in 2011 -- CBOFT moves to channel 9, but CHCH takes over the 22 spot, but from Herberts Corners. Although HC is closer to you, it's much lower down, and 14 from there doesn't seem to bother you. Also, there's a good chance that CHCH's owner Canwest (if they still own it, that is -- CHCH is for sale) will not build out that digital transmitter.
(is CJMT 14 actually directional, low power?)
Apparently, Rogers applied in 2004 to reduce power AND go directional.
Broadcasting Decision CRTC 2004-431
Ottawa, 29 September 2004
Rogers Broadcasting Limited
CJMT-TV Toronto and its transmitter CJMT-TV-2 Ottawa - Technical change
The Commission approves the application by Rogers Broadcasting Limited to change the authorized contours of its transmitter CJMT-TV-2 Ottawa by decreasing the average effective radiated power from 435,000 watts to 308,000 watts and by changing the antenna on the tower in Manotick from non-directional to directional.
The licensee indicated that this change will result in a slight decrease in the eastern coverage area.
Does your mother also get WNYF Fox 28 from Massena?
There's also a slight possibility that she can get CBS WWNY from Watertown, although chances are she'll need a full-fledged VHF-High antenna to get that. No hurry -- WWNY may be building a repeater in St Lawrence County in the next year or two.