Mystery electrical connector in under cowl near the center

[dmont]

Anybody know what this connector is for?  It appears to be an electrical connection, almost the size of a single RCA cable connector. 

Untitled by davemont12, on Flickr

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Windshield antenna.

[dmont]

Ah, so I imagine an compatible windshield would have some sort of electrical interface to plug into this. 

I haven't yet tackled the radio on this build, but I imagine I'll want to connect to this behind the dash and connect some sort of antenna to this connector if I wanted over the air radio.

[76 - 455 - 4]

Ah, so I imagine an compatible windshield would have some sort of electrical interface to plug into this. 

I haven't yet tackled the radio on this build, but I imagine I'll want to connect to this behind the dash and connect some sort of antenna to this connector if I wanted over the air radio.

Yes, the antenna wires and plug comes out at the bottom of the windshield right above that plug location. I am pretty sure you can get a replacement W/S with the plug and wires.
Or if you go with a fender mounted antenna, you just run that cable to the radio and ignore the plug in your picture.