I found this book at “archive,org” :
“Technical Description Of The Alexanderson System For Radio Telegraph And Radio Telephone Transmission
by Bucher, Elmer Eustice”
There are a lot of detailed information in this book to find.
There is also shown a drawing where voltages and currents are matched in individual antennas of
the multiple tuned Antenna.
I find it impressive that the Alexanderson antenna requires “only” 180 KW in comparison to a “Marconi flat top” antenna, which would require 1330 KW.
A less specific question for me is:
How can the “SAQ team” determine that one of the 6 leads is out of tune?