Sky propagation is not limited to send signals to receivers, line-of-sight is dependent on direction, range and objects which may occur between sender and receiver.
Sky propagation is not limited in sense of distance of source and destination and not restricted by being in range or in direction with antennas. In this case, signals are sent towards space and then signals have vast range to reach receivers back to the earth. We should consider this thing, Sky is the beyond the troposphere and ionosphere. When signals gone beyond these spheres so when satellite will reflect those signals back, they will have much vast access to receivers.
On other hand line-of-sight propagation is limited because of earth curvature. If antennas (source and target) are not directional, not facing each other or something preventing to establish the connection so communication won’t be made.
Last updated: March 19, 2014