Which term best describes a radio link that operates via line-of-sight without satellites?

• A. Direct line-of-sight link
• B. Satellite link
• C. Indirect link
• D. Global link

Answer: (A)

Direct line-of-sight link describes a radio connection that uses a straight path between the transmitter and receiver with no satellites or relay in between. This means the signal travels directly from the controller or ground station to the drone, and no orbital relay is involved. It’s the typical setup for many drone control and video links at common bands like 2.4 or 5.8 GHz, where obstacles, distance, or interference can shorten or disrupt the link. The other terms don’t fit because a satellite link would involve relay through orbiting satellites, an indirect link implies some intermediary node, and a global link isn’t a standard designation for this kind of direct, satellite-free path.