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____ are high gain antennas usually used in radio astronomy

47. ____ are high gain antennas usually used in radio astronomy.

  1. Reflector antennas
  2. Refractor antennas
  3. Lens antennas
  4. All of the above

Answer: A) Reflector antennas

Explanation:

Reflector antennas (parabolic reflectors, corner reflectors). These are high-gain antennas usually used in radio astronomy, microwave communication, and satellite tracking.

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