Heard around 0600z. Just after this I heard CHRB-1140 Alberta mixing with CBI! Also heard WRKO/680, WJR/760 and most of the New York regulars, so alas the TA season is here.
Anyways, I recorded a 1 min clip of an unid SS that bubbled up on 580. I was hearing faint English before this, likely CFRA Ottawa (which has been heard before). This doesn't seem like Cuba...? Sounds like news/talk. Maybe WKAQ PR?