It's also not on a coast and doesn't have a directional antenna. Put a similar receiving station in a coastal location in Europe we might be talking.
I haven't heard a peep from North America, either. And I've been trying for the "easy"ones. CFTR/WRKO,WCBS, WBBR, etc. And yes, I think you're absolutely right regarding the best time to listen. Bear in mind that the receiver is located at a latitude farther north than most of the U.S. Which is a good thing for DXing in Winter.