Details to come, but listen ‘ere…
0 Secs: inverted L
5 secs: Doublet
10 secs: local noise 180 Deg phase against Dubblet
16 or so: switched back in reverse order.
Enjoy the recording, pay attention to the above. You too could hear stuff on 160, but you have to make some effort (details to follow)
And… Josh, this is you on Doublet and L switching between the two