An ear-worn electronic device (100A; 100B) configured to be worn by a wearer, comprising: an enclosure configured for at least partial insertion into an ear canal of the wearer and comprising a preformed shape or a shapeable material that conforms to a shape of the wearer's ear canal, a faceplate (207a, 207b; 407; 607) and a battery door (208a, 208b; 408; 508; 608) supported by and movable relative to the faceplate; a processor disposed in the enclosure; a speaker or a receiver coupled to the processor; a radio frequency transceiver (104; 232; 308; 432) disposed in the enclosure and coupled to the processor; an antenna (106; 220a, 220b; 302; 420; 520; 620; 700; 800; 1212) supported by or integral to the battery door; and a magnetically coupled feed arrangement comprising a separable transformer, the separable transformer comprising: a first coil (304a; 410a; 510a; 610a; 712; 812; 912; 1002; 1103) coupled to the antenna and supported by the battery door (208a, 208b; 408; 508; 608); and a second coil (304b; 410b; 714; 814; 914; 1004; 1104) coupled to the transceiver (104; 232; 308; 432); wherein a conductor of the second coil is physically and electrically separated from a conductor of the first coil; wherein the feed arrangement is configured to feed the antenna via mutual inductance between the first and second coils; and wherein the second coil is supported by the faceplate (207a, 207b; 407; 607), a structure of or within the enclosure or a component in the enclosure whereby the first coil (304a; 410a; 510a; 610a; 712; 812; 912; 1002; 1103) is moveable relative to the second coil (304b; 410b; 714; 814; 914; 1004; 1104) in response to opening and closing of the battery door (208a, 208b; 408; 508; 608) relative to the faceplate (207a, 207b; 407; 607). an enclosure configured for at least partial insertion into an ear canal of the wearer and comprising a preformed shape or a shapeable material that conforms to a shape of the wearer's ear canal, a faceplate (207a, 207b; 407; 607) and a battery door (208a, 208b; 408; 508; 608) supported by and movable relative to the faceplate; a processor disposed in the enclosure; a speaker or a receiver coupled to the processor; a radio frequency transceiver (104; 232; 308; 432) disposed in the enclosure and coupled to the processor; an antenna (106; 220a, 220b; 302; 420; 520; 620; 700; 800; 1212) supported by or integral to the battery door; and a magnetically coupled feed arrangement comprising a separable transformer, the separable transformer comprising: a first coil (304a; 410a; 510a; 610a; 712; 812; 912; 1002; 1103) coupled to the antenna and supported by the battery door (208a, 208b; 408; 508; 608); and a second coil (304b; 410b; 714; 814; 914; 1004; 1104) coupled to the transceiver (104; 232; 308; 432); wherein a conductor of the second coil is physically and electrically separated from a conductor of the first coil; wherein the feed arrangement is configured to feed the antenna via mutual inductance between the first and second coils; and wherein the second coil is supported by the faceplate (207a, 207b; 407; 607), a structure of or within the enclosure or a component in the enclosure whereby the first coil (304a; 410a; 510a; 610a; 712; 812; 912; 1002; 1103) is moveable relative to the second coil (304b; 410b; 714; 814; 914; 1004; 1104) in response to opening and closing of the battery door (208a, 208b; 408; 508; 608) relative to the faceplate (207a, 207b; 407; 607). a first coil (304a; 410a; 510a; 610a; 712; 812; 912; 1002; 1103) coupled to the antenna and supported by the battery door (208a, 208b; 408; 508; 608); and a second coil (304b; 410b; 714; 814; 914; 1004; 1104) coupled to the transceiver (104; 232; 308; 432); wherein a conductor of the second coil is physically and electrically separated from a conductor of the first coil; wherein the feed arrangement is configured to feed the antenna via mutual inductance between the first and second coils; and wherein the second coil is supported by the faceplate (207a, 207b; 407; 607), a structure of or within the enclosure or a component in the enclosure whereby the first coil (304a; 410a; 510a; 610a; 712; 812; 912; 1002; 1103) is moveable relative to the second coil (304b; 410b; 714; 814; 914; 1004; 1104) in response to opening and closing of the battery door (208a, 208b; 408; 508; 608) relative to the faceplate (207a, 207b; 407; 607).