Given, height of transmitting antenna, HT=50m Height of receiving antenna, HR=80m Radius of earth, R=6400km=6.4×106m For maximum range of communication for LOS, dmax=√2HTR+√2HRR
⇒dmax=√2×50×6.4×106+√2×80×6.4×106
⇒dmax=103[√640+√1024] =57.29×103m dmax=57.28km Hence, maximum range of communication for LOS is 57.28 km.