For securing urban or isolated sites from covert aerial threats, the AN/MPQ-64 Sentinel 3-D mobile air defense radar is unmatched. With the Sentinel system, security teams can protect assets from unauthorized airborne threats flying below the horizon of air traffic control radar. The highly mobile Sentinel system delivers accurate low-altitude surveillance of small to large airborne devices, including domestic and military aircraft, unmanned aerial vehicles, helicopters, ultralights, and cruise missiles. The Sentinel will detect, identify, classify, and backplot flying devices from the nap of the earth to 55º elevation and 360º azimuth within an airspace search range of 75 km .