"Ron Hardin" wrote
Why, like clockwork, does WFAN 660 NYC, received 500 miles west in
Central Ohio, fade away at (nowadays) 6am and later come back
strong for another hour? They're strong again like a local at
almost 7am now, for instance.

Not just a random once-in-a-while thing, but regularly.
_______________

Could be interference between skywaves reflecting off different layers,
and/or with different numbers of "hops."