Might the reception have been of the Mid-Winter Anomaly type?
Last year about this time, I was at work in St. Clair PA (just north of Pottsville) hearing WGNY Newburgh. They were also playing oldies. It was maybe 1:30 PM. Yes, WGNY does send the bulk of its power west. But we're southwest. And at times, The Cornelius Brothers and Sister Rose were splashing onto WPHT 1210. WGNY 1220 was so loud at points that I had to turn down the volume.
And this past January, from just about that same spot witht he portable, I heard WDJO Cincinnati on 1480, again, early afternoon, broad daylight. That was 460 miles away. That catch HAD to have been from the Mid-Winter Anomaly .... daytime skip off the atmosphere.
Or maybe Oldies travel farther than talk on AM,