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Re: Anybody know of coaxial thru-deck connector?
Wifi antennas are often connected by a narrow-diameter coax, not the thicker ones that resemble "TypeF" or cableTV cable. Wifi cabling is also 50-ohm impedance, not the same as the 75-ohm for cableTV. You *may* very well be able to use a cableTV "bulkhead" connector, a 4-6" long double-female connector designed to bring cableTV through an exterior home wall. Those exist but probably are not going to hold up in saltwater use.
Then too, every time you add a connector you degrade the signal path, no matter how good the connector and connections are. So personally I'd suggest using a good cable "clam" and running a continous cable from the antenna to the interior.
Of course it would help if you'd confirm just what type of cable and fittings you have there.
If you do find a marine-grade wifi bulkhead connector...do share!