Australia IFR Practice Test 2025 – Complete Exam Prep

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What is the rated coverage of a VHF signal from 20,000 feet and above?

120 NM

150 NM

180 NM

The rated coverage of a VHF signal from 20,000 feet and above is approximately 180 nautical miles. This range is influenced by several factors, including the curvature of the Earth, the altitude of the transmitter, and potential atmospheric conditions that can affect signal transmission and reception.

At higher altitudes, the line of sight increases, allowing a pilot at 20,000 feet to potentially communicate with stations much farther away than from lower altitudes. This is due to the VHF radio waves' ability to travel beyond the horizon when there are fewer obstructions, such as terrain and buildings, which might affect line-of-sight communication.

Understanding the coverage range is essential for pilots, as it informs them about their ability to communicate with air traffic control and other aircraft while operating at altitude. Knowledge of VHF signal coverage is crucial for ensuring safety and maintaining effective communication during flight operations.

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