(= ultra-low frequency)

olemus
standardis Rec. ITU-R V.431-7 sagedusala 3, hektokilomeeterlained, B.hkm, 300-3000 Hz
Wiktionary:
(electronics) the band of radio waves between 300 hertz and 3000 hertz

ülevaateid
http://www.vlf.it/frequency/bands.html
https://en.wikipedia.org/wiki/Ultra_low_frequency
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3923184/
http://www.newworldwar.org/sw.htm
https://climateviewer.com/2014/10/11/haarp-elf-generation-mass-mind-control/

standardid
https://web.archive.org/web/20131031020427/http://www.itu.int/dms_pubrec/itu-r/rec/v/R-REC-V.431-7-200005-I%21%21PDF-E.pdf