Editing Very low frequency (section)

=== VLF receiving antennas ===
The requirements for receiving antennas are less stringent, because of the high level of natural [[atmospheric noise]] in the band. At VLF frequencies atmospheric [[radio noise]] is far above the [[Noise figure|receiver noise]] introduced by the receiver circuit and determines the receiver [[signal-to-noise ratio]]. So small inefficient receiving antennas can be used, and the low voltage signal from the antenna can simply be amplified by the receiver without introducing significant noise. Ferrite [[loop antenna]]s are usually used for reception.