Write the relation between the height of a TV antenna and the maximum range up to which signals transmitted by the antenna can be received. How is this expression modified in the case of line of sight communication by space waves? In which range of frequencies, is this mode of communication used?

The Relation between the height of a TV antenna and the maximum range is given by ;

$d=\sqrt{2hR}$

$\therefore$ The relation in case of the line of sight :

$d=\sqrt{2h_{R}R}+\sqrt{2h_{T}R}$

This mode of communication is used, above the frequency range of $40MHz$

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