The height of transmitting antenna is 180m and the height of the...

The maximum distance for line of sight communication is

$d = \sqrt{2hR} + \sqrt{2h ' R}$

The given data is

$R = 6400kmh = 180m$

$h ' = 245m$

Thus, the value is

$d = \sqrt{2 \times 180 \times 6400 \times {10}^{3}}$

$+ \sqrt{2 \times 245 \times 6400 \times {10}^{3}}$

$= 6 \times 80 \times {10}^{2} + 7 \times 80 \times {10}^{2}$

$= 104km$