What is the primary application of UHF frequencies?

The primary application of UHF (Ultra High Frequency) frequencies is indeed associated with secure satellite-based communications rather than the other options. UHF frequencies are effectively utilized in satellite communications due to their ability to provide reliable transmission over long distances with relatively low atmospheric attenuation.

UHF is favorable for transmitting signals through the atmosphere and is adept at penetrating various environmental obstacles, making it a suitable choice for communication with satellites. This frequency range is widely adopted in military and civilian satellite communications, ensuring secure and consistent links for transmitting data and voice communications from mobile platforms to space-based assets.

In the context of tactical communications or personnel updates, while UHF can be used for such purposes, its primary strength lies with satellite communications, particularly in environments where ground-based relay systems might be unreliable or unavailable.