![]() ![]() Because the radio signal travels in air, any obstructions between two antennas can block or reduce the signal and prevent communications. Maximum LOS distance is dependent on the height of an antenna above the ground the higher the antenna, the further the LOS distance. Direct Wave - travels through the atmosphere from one antenna to the other via a line-of-sight (LOS) mode. ![]() The groundwave signal is divided into three parts: direct wave, reflected wave, and surface wave. Ground Wave Propagation: involves the transmission of a radio signal along or near the surface of the Earth. Ask a Question / Share an Idea (Login required).Spectrum Supportability Risk Assessment.Acquisition Requirements and Verification.Spectrum Supportability/E3 Policy and Guidance.
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