Here is an unmanned helicopter that can fly up to 300 feet above the ground and provide LTE coverage from the sky to a specific area on the ground. Since it is a tethered helicopter, you get unlimited flight time for mapping and surveillance.
The helicopter has dual electric burshless motors and a 6-blade rotor system. The main rotor is foldable. The body is weatherproof. According to TT Robotix, Dragonfly has a max load capacity of 15kg.