Given, height of antenna tower, h=30m =30×10−3km Radius of earth, R=6400km We know that, d=√2Rh ....(i) where, d= distance up to which signals can be transmitted Area, A=πd2...(ii) From Eqs. (i) and (ii), we get A=π(√2Rh)2=2πRh =2×3.14×6400×30×10−3=1205.76km2 =1206km2