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Why a signal transmitted from a TV tower...

Why a signal transmitted from a TV tower cannot be received beyond a certain distance? Write the expression for the optimum separation between the receiving and the transmitting antenna.

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A signal transmitted from a TV tower cannot be received beyound a centarin distance due to attenuation and curvature of earth. Every antenna has the range. Rahge is the distance between a source and a destination up to which a signal is received with sufficient strength.
Optimum distance between the receiving and transmitting antenna.
`d_(M)=sqrt(2Rh_(T))+sqrt(2Rh_(R))`
` "where R = Radius of earth "`
`h_(T)="Height of transmitting antenna"`
`h_(R)="Height of receiving antenna"`
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