A cabinet capable of attenuating or blocking wireless signals contains, a medical device, such as an AED, an internal directional antenna mounted to an internal surface of the cabinet, an external omnidirectional antenna mounted to an external surface of the cabinet, and an electrical connection between the internal directional antenna and the external omnidirectional antenna. The internal and external antennas are configured to transmit wireless signals at particular frequencies and to receive wireless signals at the particular frequencies. The internal antenna is a high gain directional antenna, and the external antenna is a lower gain omnidirectional antenna.
