Which radio system is capable of operating in both line-of-sight and satellite modes?

• A. VHF LOS Radio
• B. UHF SATCOM Radio System
• C. HF Radio System
• D. SHF Radio System

Answer: (B)

Some radio systems are designed to cover both short-range, direct communications and long-range links through satellites. This dual capability lets you talk to nearby units when they’re within horizon and also reach distant locations via a satellite relay when they’re not.

The UHF SATCOM radio system is built for that combination. In line-of-sight mode, it can communicate with other UHF radios within the usual LOS range. In satellite mode, it connects through a satellite transponder, extending reach well beyond the horizon to distant bases or units. This versatility is what makes it the best fit for operating in both modes.

VHF LOS is limited to direct ground-range links and doesn’t typically use satellites. HF relies on ionospheric propagation for long-distance links rather than satellite relays. SHF can support satellite communications as well, but the scenario described—a system explicitly capable of both LOS and satellite operation with common field radio use—points to the UHF SATCOM option.