Grey Line example: Monaco Radio...
 

Received Monaco Maritime Radio via grey line, in Auckland, New Zealand.
Yesterday, Sep. 6, at 06:00 UTC, with an announcement preceded by chimes:

"This is Monaco Radio, Three-Alpha-Charlie" repeated for about three
minutes.

Couldn't hear their weather broadcast to the Atlantic, which is usually
around 09:33 UTC. Propagation had disappeared by then.

Mark.