 The radiation pattern of the antenna is directional, a dipole pattern, with two lobes (maxima) in the plane of the loop, off the ends of the transmission lines.In the U.S. installations two ground dipoles are used, oriented perpendicular to each other, to allow the beam to be steered in any direction by altering the relative phase of the currents in the antennas.The amount of power radiated by a loop antenna is proportional to , where is the AC current in the loop and is the area enclosed, To radiate practical power at ELF frequencies, the loop has to carry a current of hundreds of amperes and enclose an area of at least several square miles.