Is it necessary for a transmitting antenna to be at the same height...

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Is it necessary for a transmitting antenna to be at the same height as that of the receiving antenna for line-of-sight communication? A TV transmitting antenna is \( 81 \mathrm{~m} \) tall. How much service area can it
\( \mathrm{P} \) cover if the receiving antenna is at the ground level?

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