11. Antenna efficiency, ?, is a term associated with aperture antennas, e . g ., parabolic dishes . 12. Non-parabolic dishes cannot focus in this manner. 13. Abril has staked out turf in satellite-beamed television, which requires subscribers to buy a two-foot-wide parabolic dish . 14. From the room's expansive windows, it impatiently watches the assembly of the energy reflector's huge parabolic dish . 15. He refined this design as he made recordings, and eventually made a parabolic dish for the same purpose. 16. The parabolic dish for the high-gain antenna was in diameter and made from an aluminum honeycomb sandwich material. 17. The APQ-159's primary upgrade was the addition of a new planar phased array antenna, replacing the-153's parabolic dish . 18. The prop consisted of a large revolving parabolic dish from the centre of which two converging rods protruded. 19. The antenna had unexpectedly tumbled end over end, making it difficult to see if its parabolic dish had inflated. 20. Primarily intended as a harbor-defense system, it had a 48-inch parabolic dish and was usually mounted atop a tower.
