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Model: FSPL = 32.44 + 20log₁₀(d km) + 20log₁₀(f MHz). Okumura-Hata (150–1500 MHz) and COST-231 Hata (1500–2000 MHz), small/medium-city mobile-antenna correction; both empirical models assume base 30–200 m, mobile 1–10 m, distance 1–20 km.
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