A variable inclination continuous transverse stub, VICTS, antenna (30, 70), comprising: an aperture including a plurality of slots defining a feed area of the antenna, the aperture divided into a plurality of discrete subarrays; and a feed network having an input port, a plurality of output ports (36a- 36n), and a plurality of conductors, each conductor connected between the input port and a respective output port the plurality of output ports, and each output port of the plurality of output ports connected to a respective subarray of the plurality of discrete subarrays, wherein a line length of one conductor of the plurality of conductors is different from a line length of another conductor of the plurality of conductors to introduce different time delays between the input port and the respective output ports (36a-36n), wherein the line length between the input port and the respective output ports (36a-36n) is selected such that the plurality of discrete subarrays point in a same direction to create constructive interference in order to supply a prescribed inter-subarray phasing over a scan volume that maintains phase alignment of a main beam at a prescribed center frequency, and characterised in that for each subarray, at an aperture rotation angle of zero degrees, a distance between each subarray line source and a common point on a first slot of the plurality of slots in a feeding direction is identical, and as the aperture rotation angle is increased above zero degrees, a distance between each subarray line source increases linearly from subarray to subarray by an amount equal to a phase factor that aligns each of the subarrays in two dimensions at a design center frequency. an aperture including a plurality of slots defining a feed area of the antenna, the aperture divided into a plurality of discrete subarrays; and a feed network having an input port, a plurality of output ports (36a- 36n), and a plurality of conductors, each conductor connected between the input port and a respective output port the plurality of output ports, and each output port of the plurality of output ports connected to a respective subarray of the plurality of discrete subarrays, wherein a line length of one conductor of the plurality of conductors is different from a line length of another conductor of the plurality of conductors to introduce different time delays between the input port and the respective output ports (36a-36n), wherein the line length between the input port and the respective output ports (36a-36n) is selected such that the plurality of discrete subarrays point in a same direction to create constructive interference in order to supply a prescribed inter-subarray phasing over a scan volume that maintains phase alignment of a main beam at a prescribed center frequency, and characterised in that for each subarray, at an aperture rotation angle of zero degrees, a distance between each subarray line source and a common point on a first slot of the plurality of slots in a feeding direction is identical, and as the aperture rotation angle is increased above zero degrees, a distance between each subarray line source increases linearly from subarray to subarray by an amount equal to a phase factor that aligns each of the subarrays in two dimensions at a design center frequency.