Abstract: High-powered antenna installations employable in rotatable electrical systems for the transmission and reception of electromagnetic energy and, more particularly, an integral radome-antenna structure which is mounted for rotation on the exterior of an aircraft. The rotatable radome-antenna structure which is adapted to be mounted on aircraft, or possible on other suitable support installations, will prevent excessive electrical power losses encountered in present day structures, particularly inasmuch as the essential components, such as the antenna signal receiving and transmitting devices, power generating structure and air turbines, including cooling conduits for circulating coolant to and from the various components are mounted on the rotatable structure of the system, such as an equipment rack and shelf structure, so as to be rotated in conjunction with the radome-antenna structure.