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Brief Summary: The terms '''Single''', '''Twin''', and '''Quad''' refer to the number of connectors on the LNB unit, relative to the number of receivers that may be connected.The term '''Twin''' is often erroneously used to describe the housing with two LNBs.The term '''Dual''' is used to describe the double LNB in a single housing unit such as is on a Dish 500.The term '''Plus''' typically indicates an additional LNB with the capability of receiving from more than two satellites.