[Milsurplus] Antenna Connector Question

[Rbethman]

I just got one of those Military Discone antennas that were all over 
Viet Nam.  It is Antenna AT-197/GR.  The connector "looks" like an N 
connector, BUT it is larger in the thread diameter.

What connector is this, and where does one come by one?

Bob - N0DGN

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