CHWO 740 should be easily receivable in SE PA at night. I'm a little south of you in New Jersey and I listen to it regularly. It doesn't come in clearly until about an hour after sundown, but after that the reception is pretty good. They also have internet radio if you'd like to listen during the day.
www.am740.ca
I actually just tuned in their website and the actual station, the on the air feed is about a second or so ahead of the online stream. This sounds interesting.