In a free-space line-of-sight (LOS) communication system, the signal propagates directly from the transmitter to the receiver without encountering any obstacles (scatterers). Free-space line-of-sight channels are ideal scenarios that can typically be used to model aerial or space communication system applications.
[[Image:Info_icon.png|40px]] Click here to learn more about the theory of a '''[[SBR_Method#Free-Space_Wave_Propagation | Free-Space Propagation Channel]]'''.
[[Image:multi1_tn.png|thumb|500px|A multipath propagation scene showing all the rays arriving at a particular receiver.]]