an l - band radar and antenna array operating with an existing x - band surveance radar to provide a foliage penetration capability . the foliage penetration antenna consists of an array of l - band , stripline dipole / director elements placed in front of an array of broadwall waveguide slots which define an x - band aperture . the x - band aperture in addition to its own function , serves as a reflector for the dipole / director elements . aperture sharing is thus provided for a dual frequency antenna without increasing the size of the existing x - band aperture .