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Altitude band of antenna tower hazard

Remote Pilot (Part 107) practice question 19 of 31 on Airspace / Operational Requirements. ACS element UA.II.B.K4 · difficulty: recall. Want to answer it in a timed quiz? Use the Remote Pilot (Part 107) practice mode.

Question bank updated 2026-09-22

QUESTIONBelow what altitude does the Remote Pilot Study Guide advise extreme caution because of numerous skeletal structures such as radio and television antenna towers?

  1. A1,000 feet AGL, the typical antenna height
  2. B2,000 feet AGL
  3. C400 feet AGL, the part 107 altitude limit
Show the answer and explanation

Correct answer: B. 2,000 feet AGL

  • A — incorrect The guide says many towers exceed 1,000 feet AGL, which is why the caution zone extends up to 2,000 feet AGL, not only to 1,000 feet.
  • B — correct The study guide states that extreme caution should be exercised when flying less than 2,000 feet AGL because of numerous skeletal structures that exceed 1,000 feet AGL, some extending higher than 2,000 feet AGL.
  • C — incorrect The 400-foot figure is the part 107 operating limit; the antenna-tower caution in the study guide is tied to 2,000 feet AGL.

BACKGROUND

The Remote Pilot Study Guide's airport-operations chapter describes antenna towers as a flight hazard. Extreme caution is advised when flying less than 2,000 feet above ground level (AGL) because of numerous skeletal structures, such as radio and television antenna towers, that exceed 1,000 feet AGL, with some extending higher than 2,000 feet AGL. These towers are usually supported by guy wires that are very difficult to see. Although a small unmanned aircraft normally stays at or below 400 feet AGL, it operates entirely inside this caution band, so tower and wire awareness is part of every site survey.

STUDY TIP

Remember three numbers from this passage: towers exceed 1,000 feet, caution below 2,000 feet, and avoid towers horizontally by 2,000 feet.

KEY POINTS

  • Skeletal antenna towers commonly exceed 1,000 feet AGL and some exceed 2,000 feet AGL.
  • The study guide calls for extreme caution when flying below 2,000 feet AGL.
  • Small unmanned aircraft operate entirely inside this caution band.

SOURCES

  • remote_pilot_study_guide.txt ch11 "Antenna Towers"
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MORE ON AIRSPACE / OPERATIONAL REQUIREMENTS

SkyDrill is not affiliated with the FAA. This is an original practice item based on 14 CFR part 107, 14 CFR part 89, and the FAA Remote Pilot – Small UAS Study Guide (FAA-G-8082-22). Regulations and handbooks are revised; confirm details against the current edition.