39 - ATPL Question Bank in English - An aircraft is at FL100 in ISA (10,000 ft MSL). A VOR antenna at 0 ft MSL provides a usable voice-weather broadcast. Ignoring power, obstructions and service-volume limitations, what is the approximate theoretical radio-horizon range using D(NM) = 1.23 × (√h₁ + √h₂), with heights in feet?

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