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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.