Free-Space Propagation Loss

The most simple wave propagation case is that of direct wave propagation in free space.

The most simple wave propagation case is that of direct wave propagation in free space. In this special case of line-of-sight (LOS) propagation there are no obstructions due to the earth’s surface or other obstacles. We consider radiation from an isotropic antenna. This type of antenna is completely omni-directional, radiating uniformly in all directions.