Collapsible detection antenna for surgical articles

An apparatus for detection of electromagnetic tags of surgical articles in an operating room, the apparatus comprising:

• a housing comprising a handle configured to be grasped by a user;
• and
• an antenna assembly coupled to the housing and comprising a loop assembly, wherein the loop assembly comprises a conductor and a structural member enclosed inside the conductor, wherein the antenna assembly is configured to move from a collapsed configuration to a deployed configuration in which the antenna assembly forms an antenna loop configured to detect the electromagnetic tags;
• and
• a tuning board coupled to the conductor and configured to emit a signal that matches a resonant frequency of the antenna assembly in the deployed configuration, wherein the signal does not match the resonant frequency of the antenna assembly in the collapsed configuration.