I'm in Eastern PA too, Jumper. But back when there were fewer signals on the dial -- mid and late 60's -- and when the crew was DXing from about 150 miles east of here, near JFK Airport, we never heard any station from British Columbia.
Don't be discouraged by that, though.
WNEW 1130 hardly ever was off and it was an actual local to us. Once, when they were off, WDGY Minneapolis was there ... really faint. And some mornings on the car radio, technically within the Five Boroughs, WNEW would get chewed up by what was then WCAR Detroit. WCAR must already have been on their day pattern at that hour.
CKWX's daytime pattern appears to throw a substantial signal somewhat southeast. So the thought here is that your best shot at CKWX would be after sunset Mountain Time but before sunset Pacific Time. A WBBR fade would help, hi, but reception of CKWX is not out of the question. I've heard both WCBS 880 and WFAN 660 completely inaudible at times at sunset here, always on clear days locally. Ohio and South Carolina were there instead -- on the car radio, so you might want to reserve a spot on a clear day by you, too. What you'd also want to look for is a session when there's a low Auroral count, too.
WDFN Detroit 1130 completely overwhelmed WBBR one afternoon here on a table-model Zenith with just its own wound stock loop-wire antenna. So if WBBR can be 'had' by a station from the west, even though WBBR is a daytime regular here, why not look for something else?.
Btw: Where in Eastern PA are you? I may have asked that before but forgot; I'm not the insomniac DXer I once was. The den here is in scenic Metro Quakake, along I-81 between Hazleton and Pottsville.
73!
