The UPTP passive shelter antenna (repeater) is a robust, tested device specifically designed to maintain emergency communications with the outside world in civil defense shelters, underground/reinforced facilities, and other applications where signals may have difficulty passing through walls, metal structures, or the surrounding ground. The UPTP antenna is designed to receive and transmit signals—such as those from radio and cellular networks—from the outside to the shelter and vice versa, without requiring a power source.UPTP antennas are a solution manufactured in Finland that has been tested and approved for civil defense shelters and reinforced bunkers.The devices undergo various tests, including a vibration test that simulates the vibrations caused by an explosion outdoors; these vibrations are transmitted through the shelter’s concrete structures to devices such as ventilation units and passive repeaters attached to the concrete structures.The purpose of these rigorous tests is to ensure that civil defense equipment remains functional during crises.
