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you can get sma cables with a bulkhead adapter at one end. use that cable, attach to where the wifi antenna was, drill a hole in the cabinet and you can then attach your antenna to the extension cable.

Glad you got that sorted John. Just wanted to mention that I did somewhat similar - wanted to "move the WiFi 10ft away to the top of the HMI box" since that's the highest point of the machine.  Looked at external antennas but none had a cable long enough. So have Rpi --> industrial USB hub --> 10ft USB cable to a tiny  8821CU  dongle with the antenna sticking out of the HMI.  Trap for young players: that particular dongle already has a driver included in the Rpi .iso, but that driver absolutely would not work.  Had to follow the directions at the link to compile a special new driver for it.  After a lot of head-scratching and configuration, have the on-board WiFi disabled and the dongle enabled, and it works a treat.  Cheers.