As the ionosphere does wacky and wild things it's worth checking for DX oddities. Last night on 1570 I heard nothing from CKMW but there was music and spanish voice. Conditions favoured the south, allowing XERF Ciudad Acuña to make a 40 minute appearance. It wasn't a very good appearance, having lots of fading, but I did hear "la programación de La Poderosa 1570" and the phone numbers "01-800-700-1570" and "877-772-6307".
It's been over a year since I last logged them with a clear ID. The recent ionospheric upheaval has simply wiped out most of the exotic signals.