Assertion: antenna's frequency | /r/HasProperty | the itu designation
Facets:
value: in the range of 3–30 khz
type: LOCATION
value: for radio frequencies
type: OTHER
Source sentences:
text: Very low frequency or VLF is the ITU designation for radio frequencies (RF) in the range of 3–30 kHz, corresponding to wavelengths from 100 to 10 km, respectively.