Discussion
Why do radio telescopes tolerate a heavier illumination taper than communication antennas?
Answer: B
Ground pickup and confusion from outside the beam corrupt a radiometric measurement, so a heavier taper is accepted in exchange for lower side lobes and higher beam efficiency, even though it costs gain. A communication antenna is usually more concerned with the signal to noise ratio in its main beam. Reflector size, receiver sensitivity and frequency are not the reason. The design follows from what the instrument's output is going to be used for.
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