Which frequency band is primarily used by the Army and other ground personnel due to excellent line-of-sight capability and insensitivity to vegetation?

• A. VHF
• B. UHF
• C. HF
• D. SHF

Answer: (A)

Frequencies chosen for ground-to-ground communications hinge on how signals propagate through vegetation and around obstacles. The VHF band is the best fit here because its longer wavelengths diffract around trees and brush, which helps maintain a reliable line-of-sight link in forested terrain. At these frequencies, foliage causes relatively less signal loss than higher bands, so troops can stay connected without needing perfectly clear paths. VHF radios are also practical in size and rugged for field use, and they don’t suffer as much from weather effects as microwave bands. In contrast, HF relies on long-range skywave propagation beyond line-of-sight, which isn’t the scenario described; higher microwave bands (SHF) are heavily attenuated by vegetation and require very clear paths, while UHF, though line-of-sight, tends to be more affected by trees than VHF. That combination makes VHF the most robust choice for Army ground personnel operating in vegetation-rich environments.