Glad you got it solved, my guess is still a signal change that the older receivers could not handle. Everything from reflection interference to signal overload. Basement test would reduce overload and reflection issues. A family member at Steeles and Hwy 400 just uses a four bay in front ground window and no preamp, receives most channels, even Buffalo, outside antenna 20 feet above ground with amp not much better, weird but that's rf with reflections and ground waves.