At mid-night, what would be the best choice in attempting to communicate, using NBDP with a shore station some 800 miles distant?

Correct Answer: Option C — HF bands

At 800 miles during midnight, the signal must rely on sky wave propagation. HF bands are the only suitable choice for this distance, as VHF-FM is limited to line-of-sight and UHF is generally unsuitable for long-range maritime communication. The lower HF bands are typically most effective for nighttime sky wave.