Yes, theoretically, the door would swing both ways. Of course, the Mississippi Coast does not have any big-signal AMs anymore, since the demise of WVMI/570, BUT that isn't the end of the question. While Tampa's 620 had a MUCH bigger signal, I would get 1340 (1kW) from Clearwater, FL on the Coast. It was much weaker, and would only be noticeable in the absolute middle of the day (as ANY skywave would cover it up), but it was audible. We can assume, then, that even the smaller-signal stations are going well out to sea.
You can bet that WWL is heard in Central FL. But, WWL is a special case.
WROA? I can't verify SOUTH America, but I can confirm CENTRAL America. I heard it myself, back in the 1980s, in San Pedro Sula, Honduras. It was the strongest US station on the dial. Very surprising, actually. (I picked up an FM from San Pedro in Pascagoula once or twice, but that was sporadic-E, of course. 91.7, if memory serves)
The "tick-tock" station? It's called Radio Reloj, literally, "Radio Clock." I suppose the time clicks go along with the theme. Oddly, though, match them up sometime to WWV; you'll find they don't necessarily match. Time is relative, it would seem, in Cuba. But, then again, when you think about it, it's still 1963, or thereabouts, down there.
DE
DE
