opposite direction is absorbed rather than reflected by three layers of gradual transition to a heavy absorbing layer a lossless layer 31 is first bonded to the rear of the spiral antenna followed by a medium lossy foam layer 32 and subsequently followed by a heavy lossy foam layer 33 it is to be understood that the thickness of the various layers has been greatly exaggerated for clarity and perspective in understanding the constituent components thereof each of the above described five layers the two layers of dielectric material and three layers of foam material are permanently bonded together by conventional means using standard adhesives for such materials or by various heat treatment methods known to those experienced in the art in addition a ring of heavy lossy foam material surrounds the periphery of the spiral antenna dielectric substrates to attenuate stray radiation reflection or leakage around the edge of the spiral antenna device to accommodate the theoretical necessity that the arms of a spiral antenna in general must be infinite in length and not terminated short thereof thereby causing transmission energy reflections along said spiral arms resistive elements are tied to the ends of each spiral arm as follows balanced termination pad 16 of first spiral antenna 15 is coupled to ground by a resistive element terminal balanced pad 18 of second radiating spiral antenna 17 is coupled to third enlarged balanced pad 26 of third radiating spiral 23 and each are then coupled again to ground through.