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Model: ITU-R P.838-3 specific attenuation γ = k·R^α (regression coefficients, any frequency, H/V/circular). ITU-R P.530-19 §2.4.1: A0.01 = γ·d·r with the distance factor r (eq 32), other time percentages by eq 34. Rain only, annual statistics — multipath fading is separate.
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