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This is a SD (Standard Definition) satellite receiver with HD capabilities for over the air signal. This satellite receiver has a built in Digital TV Receiver for broadcast TV. The 381 is the same as a Model 811, less HD satellite capability. Dish Network describes this odd little beast as "A standard definition satellite receiver with the added benefit of being able to view analog/digital (HD) over-the-air broadcasts using HD outputs.This is a SD (Standard Definition) satellite receiver with HD capabilities for over the air signal. This satellite receiver has a built in Digital TV Receiver for broadcast TV. The 381 is the same as a Model 811, less HD satellite capability. Dish Network describes this strange receiver as "A standard definition satellite receiver with the added benefit of being able to view analog/digital (HD) over-the-air broadcasts using HD outputs.