to the other the actuator is coupled to an electrical controller by flexible electrical leads or cables neither of which is illustrated in the figures the actuator rotatably positions the bracket 19 antenna 1 and mirror 5 about the axis of rotation of the rotary joint which axis is referred to herein as the outboard axis x 1 bracket 21 is rotatably supported in turn by a third bracket 23 which thereby supports all the elements supported by bracket 21 a second electrical actuator 26 is situated on one of the brackets 21 and 23 and its rotary output is coupled to the other actuator 26 rotatably positions bracket 21 hence positions the assembly of the four mirrors and antenna about the axis of rotation of the rotary joint referred to herein as the midboard axis y 1 the midboard axis is oriented by bracket 21 in fixed position perpendicular to the outboard axis earlier described as those familiar with the dual axis beam type dual reflector antennas recognize excepting for certain aspects of bracket 23 the structure described to this point resembles the existing land based dual axis beam waveguides in which the four mirrors are rotated as a unitary assembly about an azimuthal axis and the one mirror at the main reflector though retaining in the same spacial relationship to the other mirrors is rotated with the antenna about an elevation axis bracket 23 contains a number of portions including an upper portion and an intermediate tubular portion which are adjustable in relative rotational position and a lower portion which attaches to and supports flat mirror.