Near vertical incidence skywave, or NVIS, is a skywave radio-wave propagation path that provides usable signals in the medium distances range — usually 0–650 km (0–400 miles).

Dec 11, 2024 · To use NVIS, in addition to choosing an appropriate frequency where the ionosphere is cooperative, we want to radiate our signal straight up (or close to it). One advantage with this …

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 …

Wide-bandwidth NVIS antennas can have horizontal (azimuth) directivity variance that can be mitigated in a number of ways. The SWR of a wide-bandwidth NVIS antenna must be addressed to minimize …

Near Vertical Incidence Skywave (NVIS) is an ionospheric skip operating technique that directs the strongest signals from a station vertically, or upward, rather than toward the horizon.

Unlike traditional low-angle skywave signals, the signals from a NVIS antenna are returned from the ionosphere almost vertically, and thus NVIS can provide local or regional coverage as well as …

Dec 1, 2025 · NVIS, or Near Vertical Incidence Skywave, is a high-frequency radio technique where you send signals almost straight up into the sky. The ionosphere bends these signals back down, so you …

Although not all radio amateurs have heard the term NVIS, many have used that mode when making nearby contacts on 160 meters or 80 meters at night, or 80 meters or 40 meters during the day.

What is NVIS?1 Near Vertical Incidence Skywave Antenna? NVIS is a skywave radio-wave propagation path that provides usable signals in the near-field distance range up to 400 miles.

AA properly designed Near Vertical Incident Skywave (NVIS) antenna will have a directivity pattern that will maximize transmission and reception at high angles while rejecting low angle, long range noise.