Nomenclature gets tricky with the cyborgs, but I’d say if they’re metal, conductive, and serving as resonators for electromagnetic radiation, they’re antennas, and if they’re made of chitin or other organic compounds and they recognize epitopes by sensing charges and polarity, they’re antennae.
Actually, I guess the nomenclature is pretty straightforward even on the cyborgs (though they do make a weird situation even weirder).
