Yes 15 meters often open!But mostly I can hear the stations in AM not strong.
Like today, this afternoon by me!
I heard a station from the USA on 21420 khz.
But I hear only a few words and then his signal were gone...
Such effect I have often last days on 15 meters.
Then I am 100% sure there is a station....
But I keep my Žeyes and ears' around 21420 khz..... hi, hi...
Greetings,
Henk
pe1mph