A band is a smaller section of the radio communications spectrum. Channels are usually used or reserved for specific applications.
| VLF | Very Low Frequency | 3-30 kHz |
| LF | Low Frequency | 30-300 kHz |
| MF | Medium Frequency | 300-3000 khz (or 3 MHz) |
| HF | High Frequency | 3-30 MHz |
| VHF | Very High Frequency | 30-300 MHz |
| UHF | Ultra High Frequency | 300-3000 MHz (3 GHz) |