Extremely Low Frequencies
Extremely Low Frequencies (ELF) are the "longest wavelength in the electromagnetic spectrum (>10cm)" which can be "longer than a football field to as short as a football." 
"Extremely low-frequency (ELF) radio waves are of interest for communications systems for submarines. The weak absorption by seawater of ELF waves and prominent resonances in water makes the range suitable for this reflection from the Ionosphere.
"Although radio waves are practically harmful, ELF waves and oscillating magnetic fields that occur near electric power transmission lines can have adverse effects on human health and the electrochemical balance of the brain. Prolonged exposure can even lead to diseases like leukemia, lymphoma, and brain cancer in children." 
Related SourceWatch Resources
Articles & Commentary
- Dr. Nick Begich, "Biohazards of Extremely Low Frequencies (ELF)," Earthpulse Flashpoints, Series 1 Volume 1 (2005/2006).
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