[Milsurplus] Collins 18S-4 Squadrons

[B. Smith]

I have a Collins 180K-3 antenna matching network indicating  that the 18S-4 
was used by SAC on B-47 or possibly on mission support  aircraft stationed 
at MacDill AFB, Florida.

Does anyone have any documentation on military units that utilized the 18S-4 
prior to the change over to AM with suppressed carrier(SSB).

I am particularly interested in information on MATS usage where it was 
installed on C-54 aircraft for  East Coast (ESTAF) Transatlantic missions.
73
breck k4che