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According to Howeth http://earlyradiohistory.us/1963hw.htm
Specifically in http://earlyradiohistory.us/1963hw18.htm section 6,
there was another trans-Atlantic station at Tuckerton N.J.,
built by the US subsidiary of the German Homag Co. The
conclusion is that the Germans were anticipating the need for
multiple radio links across the ocean. Also note in that
section exactly when and why the US Navy took over operation
at Sayville. Were Browning and Fast Freddie dealing with US
sailors those evenings?

Also from Howeth, the Sayville-Nauen link operated at 25KHz--
a Very Low Frequency. Various Navies of the world now use that
frequency range for world-wide communications because distant
propagation is power-efficient and the signals will penetrate
several meters into sea water where submerged antennas can
receive them. My professional experience lies in this area.
They were getting reliable trans-Atlantic traffic with 100
kilowatts and less--no big deal with the technology of the times.

From elsewhere in Howeth, the Sayville station's two antenna towers
formed a directional pattern aimed at Europe and rejected signals
to the North and South. This helped the receiver reject static
from the thunderstorms prevalent in the tropics which propagates
as far as the radio signals at those frequencies. The directional
antenna also helped reject interference from all the wideband
spark transmitters up and down the US East coast. There lies the
problem for anyone trying to jam communications to Sayville.

Howeth again: The American Marconi Company was under the control
of their British parent. If there was an interest in jamming
the Sayville station, there were plenty of transmitters along
the US East coast that could be put to the task--if:
1) The jamming station could operate at 25KHz. Back then,
operating frequency was set by the resonant length of the antenna.
The long wavelengths for trans-Atlantic communications took big
antennas. These would have taken months to build if not already there.
and 2) Jammer power would need to be exceedingly high to overcome
the antennas at Sayville designed to reject just such interference.

My conclusion is that the Germans did what they could to
anticipate and mitigate loss of the trans-Atlantic cable and make
their radio links reliable.