A wearable electromagnetic, EM, apparatus includes: at least one antenna operable in a millimeter-wave-radar-based, MWRB, application; at least one computer processor disposed in signal communication with the at least one antenna; an attachment system configured and adapted to attach to an actor; the at least one antenna and the at least one computer processor disposed in a supported relationship with the attachment system, such that the attachment system with the supported at least one antenna and the at least one computer processor at least partially forms a wearable apparatus that is wearable by the actor.