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The International telecommunications Union, ITU frequency bands define a set of portions of the radio frequency spectrum: VLF, LF, HF, VHF, UHF, EHF, etc .
Sustainability, Free Full-Text
Recent Activities of ITU-R Study Group 5 on Terrestrial Radiocommunication Systems
High frequency - Wikipedia
Key ITU spectrum allocation above 100 GHz with RR5.340 prohibited
Radio spectrum - Wikipedia
Table 1.2 from Table 1.2 Frequency Band Designations Label Nominal Frequency Range Itu—region 2 Line-of-sight Propagation and the Radio Horizon
Spectrum Allocation - an overview
ITU Archives - Microwave Link
Confused about RF-band letter designations? That's not surprising!