Given, height of transmitting antenna, HT=320m Height of receiving antenna, HR=2000m Radius of earth, R=6400‌km=6.4×106m For maximum range of communication for LOS, the maximum range can be calculated as d=√2HTR+√2HRR Substituting the values in above expression, we get d=√2×320×6.4×106+√2×2000×6.4×106 d=103[√4096+√25600]=224×103m d = 224 km Hence, maximum range of communication for LOS is d = 224 km.