Radio frequency spectrum
| ITU | Band name | Frequency | Wavelength |
| 1 | ELF | Extremely low frequency | 3 | Hz | 30 | Hz | 100.000 | KM | 10.000 | KM |
| 2 | SLF | Super low frequency | 30 | Hz | 300 | Hz | 10.000 | KM | 1.000 | KM |
| 3 | ULF | Ultra low frequency | 300 | Hz | 3.000 | Hz | 1.000 | KM | 100 | KM |
| 4 | VLF | Very low frequency | 3 | KHz | 30 | KHz | 100 | KM | 10 | KM |
| 5 | LF | Low frequency | 30 | KHz | 300 | KHz | 10 | KM | 1 | KM |
| 6 | MF | Medium frequency | 300 | KHz | 3.000 | KHz | 1.000 | M | 100 | M |
| 7 | HF | High frequency | 3 | MHz | 30 | MHz | 100 | M | 10 | M |
| 8 | VHF | Very high frequency | 30 | MHz | 300 | MHz | 10 | M | 1 | M |
| 9 | UHF | Ultra high frequency | 300 | MHz | 3.000 | MHz | 100 | cm | 10 | cm |
| 10 | SHF | Super high frequency | 3 | GHz | 30 | GHz | 10 | cm | 1 | cm |
| 11 | EHF | Extremely high frequency | 30 | GHz | 300 | GHz | 10 | mm | 1 | mm |