What is the name of this antenna jack?

I have a hand-me-down Insignia (Best Buy house brand) stereo receiver. The FM antenna jack is identical to the one I've circled in this picture. It's not an "F" connector; It's certainly not a BNC connector (although it's about that size). I'm guessing that it's standard for... show more I have a hand-me-down Insignia (Best Buy house brand) stereo receiver. The FM antenna jack is identical to the one I've circled in this picture.

It's not an "F" connector; It's certainly not a BNC connector (although it's about that size). I'm guessing that it's standard for another market; Europe or Asia, maybe.

I need an adapter for a U.S. style "F" connector, or a conector I can crimp on to an RG-59 cable, but first I need to know the name of THIS connector.

Anybody recognize it?
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