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

• A

  $80.2 \mathrm{km}$
• B

  $144.1 \mathrm{km}$
• Correct answer
  C

  $57.28 \mathrm{km}$
• D

  $45.5 \mathrm{km}$

Hence, the correct answer is option: 'C'.