$GTCH SAN DIEGO, Aug. 19, 2021 (GLOBE NEWSWIRE) -- GBT Technologies Inc. (OTC PINK: GTCH) ("GBT” or the “Company”), is now testing - Near Vertical Incidence Skywave (NVIS) Antenna Technology for its Infinia long range communication. The NVIS technology is targeted to assist with dead zone coverage. Typical HF radio waves reach very long distances but there is the challenge of covering the skip zones. NVIS (Vertical Incidence Skywave propagation) is a type of ionospheric radio transmission that can be used to fill the gaps between line of sight and longer distance skip zones that are used at HF bands; especially, with rough terrain and geographical obstacles.

https://www.wsj.com/articles/gbt-near-vertica...20?tesla=y