 SAN DIEGO, Aug. 10, 2021 GLOBE NEWSWIRE -- GBT Technologies Inc. OTC PINK: GTCH GBT or the Company, is now evaluating and testing self-tuned antenna technology in order to enhance its Infinia Long Range radio performance. An automatic antenna tuning system a technology that improves power transfer between the transmitter and antenna to adapt to ionospheric propagation conditions, ensuring the optimal communication performance. High-frequency HF radio, also known as shortwave radio, enables worldwide coverage due to electromagnetic wave refraction in the ionosphere, this phenomenon is also known as skywave propagation. 