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It’s a bit of speculation, but since it’s built as an RCA system, it should be essentially the same as
the Riverhead receiving system.
At this Forum I have put together what I found.
The most important original sources so far are:
h t t p s://www.crosscountrywireless.net/The%20Wave%20Antenna.pdf
”The Wave Antenna A New Type of Highly Directive Antenna”
(Diagrams of ”wave-antenna” / principle circuit of HF-Stages)
h t t p s://ur.booksc.me/book/32038623/02831e
”The Electrical Plant of Transocean Radio Telegraphy”
BY E. F. W. ALEXANDERSON, A. E. REOCH and C. H. TAYLOR
Even more speculation is the detector, 2 interesting patents from Dr. Alexanderson
(just ”in time”):
US1535082A ELECTRON DISCHARGE DEVICE
CA208846A SIGNALLING SYSTEM
In this case a kind of ”electronic tone wheel” would have been developed for the receiver.
In any case, one suspects a kind of heterodyne or non-synchronous detector, since a superimposed tone must be generated
that is audible in the headphone.