of frequency bands (VLF, ELF... etc.)". IK1QFK Home Page (vlf.it). NASA live streaming ELF -> VLF Receiver Amateur Radio Below 10 kHz "G3XBM's page on Earth Mode Communication" Review of Earth Mode Communications "1966 abstract about Earth Mode Comms by Ames, Frazier and Orange" Radio communications within the Earth's crust "Abstract of article by Burrows written in 1963" Radio spectrum