#directional_antenna__directionalantenna  an antenna that transmits or receives signals only in a narrow angle
  supertype:  #aerial__antenna__transmitting_aerial  an electrical device that sends or receives radio or television signals
  subtype:  #array.directional_antenna  an arrangement of aerials spaced to give desired directional characteristics
  subtype:  #dish_antenna__dish__dish_aerial__saucer  directional antenna consisting of a parabolic reflector for microwave or radio frequency radiation
     subtype:  #scanner  a radar dish that rotates or oscillates in order to scan a broad area
  subtype:  #yagi__Yagi_aerial  a sharply directional antenna

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