antenna adaptor for Roksan Caspian

I recently bought a Roksan Caspian tuner, on the used market. It did not come with an antenna. I planned on using my Godar flat antenna, which has a standard (BNC?) connector. However, the Caspian tuner has a different, larger connector. I tried Radio Shtick, but they didn't have an adaptor that would fit the tuner. Anyone know what the connector on the back of the Caspian is called, and where I might find an adaptor that would enable me to link to my Godar antenna? Thanks! Ben
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email MayAudio or Roksan, they respond usually. Or Mike Godar or Gene Rubin Audio in Ventura ? county CA. Gene carries the Godar. Parts Express can sometimes help also.