... Calculate path loss using the Free-Space, ITU Terrain, Hata Urban, Hata Suburban, Hata Open Area, COST 231 Hata Extended, Weissberger, or Empirical COST-Walfisch-Ikegami (Also known as ... Empirical') non Line-of-Sight (n-LoS) and Line-of-Sight (LoS) mathematical models -- OR -- run the models backwards to get the matching distance for a ...