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 …

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 …

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 …

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 …

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.

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 …

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 …

There is no fundamental difference between NVIS and conventional skywave propagation; the practical distinction arises from different desirable radiation patterns of the antennas (near …

4 days ago · NVIS propagation is used to fill in between the distance that is normally covered by ground wave and the first hop for low angle of radiation long distance communication. This …