Which feature is not characteristic of Ultra High Frequency (UHF) Line of Sight communications?

Ultra High Frequency (UHF) Line of Sight communications are defined by several key characteristics that impact their functionality. The most significant of these is the requirement for a clear line of sight between the transmitting and receiving antennas. This means that physical obstructions such as buildings, hills, or tree lines can disrupt or block the communication signal, making it essential for the transmitting and receiving points to be visibly unobstructed.

The feature that does not align with UHF Line of Sight communications is the ability to bend around obstacles. This characteristic, which is typically associated with lower frequency communications such as Very Low Frequency (VLF) or Low Frequency (LF), allows signals to diffract or reflect around terrain or obstacles. However, UHF signals are more likely to be absorbed or blocked by such physical barriers rather than bending around them.

Ground-to-air and air-to-air communications are indeed part of UHF Line of Sight capabilities, emphasizing its usage in aviation and mobile communication scenarios, where clear paths are often maintained to ensure reliable transmission. Therefore, it is precisely the inability of UHF signals to bend around obstacles that distinguishes them from other communication systems that operate on different frequency bands.