Betty really did provide a fascinating window into a very unique event, IMO.
Ric's reply ("Didn't you hear me? I said Norwich City...") is a poignant reminder of one of the more unlikely details, as I see it, had this been a hoax or mere commercial dramatization playing out. Why would "something like NYC NYC..." pop up in such a message? And there lay a wreck such a similar name which almost certainly would be identifiable to a strandee by some means either aboard her, or among the stuff left behind at the site by her survivors. It is strongly arguable that they would not have known the island by its name.
Other details leap out - like the reference to the battery ("watch that battery" or to that effect) - what dramatist or re-enactor would think of that sort of thing, or know enough about Earhart's plane and predicament to discern that a battery might have been imperiled by where it was placed (nav station in rear, for one), etc.?
I'm well familiar with all the criticisms, and well aware of the remoteness of the possibility of these signals coming through - and yet Betty gave us something utterly singular: a snapshot of something that well may have been Earhart in her last hours of contact. She did so by means of a special antenna that her clever father had rigged, and by a rather nice radio set of the day. The right stars seem to have fallen for a bright and curious young girl at the time. I'll always believe she was utterly faithful in her report, and that what she reported was, despite the odds, very likely the real deal. Same for Dana Randolph and a handful of others, but it was Betty who brought us so much rich detail.