accordance with the present invention a five horn primary feed structure illuminating a lens is illustrated in fig3 a 3b 3c and 3d to be described the transmission line configuration of each of the five horns in fig3 a 3b 3c and 3d is identical to that described and illustrated in fig1 a with the exception that the center horn is symmetrically flared out at both sidewalls as opposed to only one sidewall flare for the four other horns and with the further exception that the center horn is not flared out at the top broadwall as are the four other radiating horns coaxial inputs 50 52 54 56 and 58 are the inputs via the ridge waveguide transmission line of the present invention to the five radiating apertures 60 62 64 66 and 68 respectively coaxial input 50 couples through its transmission line to radiating aperture 60 which is the central radiating horn of the five horn assembly illustrated in fig3 a 3b 3c and 3d similarly the lower two coaxial inputs 52 and 54 coupled to the lower two difference horns which are the radiating apertures 62 and 64 respectively likewise the upper two coaxial inputs 56 and 58.