What is satellite microwave?

If the height of a tower used for LOS communication is increased by $21\%$, then percentage change in range is

Height of receiving and transmitting antenna in communication of a signal are $245 \mathrm{m}$ and $180 \mathrm{m}$ respectively. Find the maximum distance between the two antenna for proper communication.

The height of a transmitting antenna at the top of a tower is $25 \mathrm{m}$ and that of receiving antenna is, $49 \mathrm{m}$. The maximum distance between them, for satisfactory communication in LOS (Line of Sight) is $K\sqrt{5}\times {10}^2 \mathrm{m}$. The value of $K$ is _____ .

(Assume radius of Earth is $64\times {10}^5 \mathrm{m}$) [Calculate upto nearest integer value]

By what percentage will the transmission range of a TV tower be affected when the height of the tower is increased by $21\%$?