[ARC5] TBC Connector

[releazer at earthlink.net]

I am going to need to couple a BNC cable to a connector on an AT-1108/ARC antenna to use my ARC-116.  There are two connectors on the AT-1108, which is a dual band blade antenna for 118-135 MHZ and 220 - 400 MHZ.  One is female BNC, which I assume is the VHF connection.  The other one is a female connector that is the size of a BNC in terms of diameter but has screw threads instead of locking lugs; is that connector TNC?

Thanks!

Wayne 
WB5WSV