$GTCH -- GBT Technologies Inc is now evaluating an
Post# of 98044
Guided by rules of physics, the lower the frequency is, the greater distance it can travel, yet low frequencies are sensitive to other issues. VHF (Very High Frequency) and UHF (Ultra High Frequency) radio waves travel in LOS (“Line-of-Sight", which defines their maximum communication range. High frequency (HF) radio communications can reach beyond line of sight by using the ionosphere to refract radio signals back to earth.