A transmitting antenna at top of a tower has a height of 50 m, and the height of receiving antenna is 80 m. What is the range of communication for the line of sight (LOS) mode?
[use radius of the earth $= 6400\text{ km}$]
(1) 80.2 km
(2) 144.1 km
(3) 57.28 km
(4) 45.5 km