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is that the feed, with its waveguides and "front end" electronics does not have to be suspended in front of the dish, so it is used for antennas with complicated or bulky feeds, such as large satellite communication antennas and radio telescopes. Aperture efficiency is on the order of 65-70%.
* Gregorian - Similar to the Cassegrain design except that the secondary reflector is concave (ellipsoidal)

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