2-millimeter band
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The 2-millimeter band is a portion of the EHF (microwave) radio spectrum internationally allocated to amateur radio and amateur satellite use. The band is between 134 GHz and 141 GHz.[1]
Due to the lack of commercial off the shelf radios, amateurs who operate on the 2 mm band must design and construct their own equipment, and those who do, often attempt to set communication distance records for the band.