| High frequency ✕ | |
|---|---|
| Abbreviation | HF |
| ITU band | 7 |
| Min frequency in air (Hz) | 3000000 |
| Max frequency in air (Hz) | 30000000 |
| Min period in air (s) | 0 |
| Max period in air (s) | 0 |
| Min wave length in air (m) | 99.930819 |
| Max wave length in air (m) | 9.993082 |
| Example of use | Shortwave broadcasts, citizens band radio, amateur radio and over-the-horizon aviation communications, RFID, over-the-horizon radar, automatic link establishment (ALE) / near-vertical incidence skywave (NVIS) radio communications, marine and mobile radio telephony |