Is it necessary for a transmitting antenna to be at the same height on that of the receiving antenna for the line of sight communication ? A T.v transmitting antenna is $81 m$ tall.How much service area it can cover if the receiving antenna is at the ground level ?

Question

$\begin{array}{1 1} 3258.5\;sq.m \\ 3258.5 \;sq.km \\ 32585 \;sq.m \\ 32585\;sq.m \end{array}$