angle u03b1 all active panels 14 will seem to substantially border i e be contiguous to or touch each other to allow that for a range of tilting angles u03b1 tilt axes 16 of active panels 14 may be slidably attached as schematically indicated at 18 to a support construction 19 with possible movement in a direction parallel to reference plane 11 as shown by arrows 18 so that tilt axes 16 of all active panels 14 remain substantially parallel to each other and perpendicular to support construction 19 thus distance d may be controlled said control of distance d may be aimed to follow the adaptation of receive transmit angle u03b1 so that non overlap of outer lines of adjacent active panels 14 as defined above is maintained for all values of u03b1 within an operable design range it has been determined that an antenna configured according to the principles set out herein greatly reduces the loss of gain of the antenna beam due to sub array plane to sub array plane partial coverage furthermore because all the active panels 14 are fully open to radiation impinging on antenna 10 at the angle of incidence u03b1 then the entire active panel apertures across the entire antenna 10 add up i e coherently combine for receive or split for transmit to make the antenna 39 s total effective aperture size high and.