Figure 1.1 from Table 1.2 Frequency Band Designations Label Nominal Frequency Range Itu—region 2 Line-of-sight Propagation and the Radio Horizon | Semantic Scholar
kb/frequency-bands-and-channels | rsibda
Why Is The US Strip Mining Radio Spectrum? - LBA Group Blog
The Many Frequencies of RF Communication | The Electromagnetic Spectrum | Electronics Textbook