![]() This independence of local infrastructure is essential for disaster relief communications, when the infrastructure is destroyed by a large scale natural disaster, or in remote regions where this infrastructure is lacking. ![]() The NVIS propagation mechanism enables communication in a large area without the need of a network infrastructure, satellites or repeaters. Recently, interest in radio communication via Near Vertical Incidence Skywave (NVIS) propagation has revived, not in the least because of its role in emergency communications in large natural disasters that took place in the last decade.
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