I was doing this with UHF connectors before I switched to plate antennas. The UHF chassis jack has a 4 hole plate for secure attachment, there are elbows, and the serrated prongs securely lock the orientation. 3/8" PEX tubing with aluminum tape on the outside, then covered heatshrink tubing, gives a nice "rubber duckie" type design. I used the internal connector to keep ESD exposure to a minimum when handling the antenna, and left the outer connector floating.
The F connectors are good cheap connectors with frequency range over 2 GHz, which imply it is more than enough for coupling a theremin's antenna. The UHF connectors have also an extended frequency range, they are more expensive but have a more secure fixation. I would use F connectors for a coaxial cable, they are made for that, but for direct plugin of a metallic antenna, I would use UHF connectors. BNC connectors are good for coaxial cables too.
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