Earth station.

Earth station. A station located either on the Earth's surface or within the major portion of the Earth's atmosphere intended for communication:
(1) With one or more space stations; or
(2) With one or more stations of the same kind by means of one or more reflecting satellites or other objects in space. (RR)

Source

47 CFR § 25.103


Scoping language

Terms with definitions including the (RR) designation are defined in the same way in 2.1 of this chapter and in the Radio Regulations of the International Telecommunication Union.

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