How far can NVIS communications potentially travel?

NVIS, or Near Vertical Incidence Skywave, communications can be an effective means of long-distance communication, particularly in situations where traditional line-of-sight methods are insufficient. NVIS uses high-frequency (HF) radio waves that are transmitted almost vertically into the ionosphere. These waves are reflected back down to Earth over relatively short distances, typically ranging from about 30 to 300 miles.

The key characteristic of NVIS is its ability to enable reliable communication over this moderate range by using high angles of radiation, which allows signals to bounce off the ionosphere and back down to the ground, making it well-suited for regional communications. It proves especially useful in mountainous areas or where typical RF propagation would be impeded. Thus, the potential distance NVIS communications can travel is correctly understood to be up to 300 miles, which allows for effective communications across broad regions without requiring extensive infrastructure.