Completing the ICS 213 General Message Form
What is NVIS propagation? “NVIS coverage has been described as
similar to squirting a hose with a spray nozzle straight up thus
producing an “umbrella” of rain for a substantial radius around the hose.”
Near Vertical Incidence Skywave (NVIS) is a propagation mode which uses high angle radiation to send signals almost straight up to be reflected back to Earth for very effective short to medium distance communications. This mode of operation makes it ideal for in-state communications during disasters or other emergency situations. The military has used NVIS techniques for decades to provide short haul communication with other units on the ground. Read More Here..