| Answer | Crossword Clue |
|---|---|
| elfs | any frequency between 30 and 300 hertz |
| VHF | Like any channel between 30 and 300 MHz |
| UHF | Frequency between 300 and 3,000 MHz |
| shortwave | A radio wave of a wavelength between about 10 and 100 m (and a frequency of about 3 to 30 MHz) |
