This Recommendation provides specifications for radio-frequency channel arrangements for systems in the fixed service with channel separations ranging from 2.5 to 112 MHz in the bands 36-37 GHz@ 37.0-39.5 GHz@ 38.6-40 GHz and 39.5-40.5 GHz. One Annex (Annex 2) includes block-based arrangements with bandwidths of 50 MHz and 60 MHz in the frequency range 38.06 to 40 GHz.