Explanation

• Television signals cannot be received ordinarily beyond a particular distance due to the curvature of the earth.

Key Points

• Signal waves travel in a straight line from the transmitting antenna to the receiving antenna. The signal transmitted from a TV tower cannot be received beyond a certain distance because the surface of the Earth is curved.
• This is due to, after going a certain distance the frequency of television signals decreases while their wavelength increases.
• Signal waves transmitted from a transmitter get absorbed or blocked by the curvature of Earth and are not received. 

Additional Information

• Signal:
  • Information converted in electrical form and suitable for transmission is called a signal.
  • Signals can be either analog or digital.