KNW-117 NVIS Part 1
KNW-117NVIS – Near Vertical Incidence Skywave Near Vertical Incidence Skywave (NVIS) refers to a radio propagation mode which involves the use of antennas with a very high radiation angle, approaching or reaching 90 degrees (straight up), along with selection of an appropriate frequency below the critical frequency, to establish reliable communications over a radius of … Read more