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Answer :
Final answer:
VHF and UHF radio signals travel farther than the visual line of sight due to the diffraction properties of their wavelengths. FM, TV, and mobile phone antennas are often elevated to achieve an unobstructed line of sight.
Explanation:
VHF and UHF radio signals usually travel somewhat farther than the visual line of sight distance between two stations due to the nature of their wavelengths. VHF signals have longer wavelengths, ranging from 30 to 300 MHz, while UHF signals have even shorter wavelengths, ranging from 300 MHz to 3 GHz.
These longer wavelengths allow the radio signals to diffract or bend around obstacles such as buildings and hills, similar to how ocean waves can go around large rocks. This phenomenon is known as diffraction and it allows VHF and UHF signals to reach areas that are not within the direct line of sight.
In contrast, FM and TV signals, which are transmitted on VHF and UHF frequencies, are best received when there is a clear line of sight between the broadcast antenna and the receiver. To achieve an unobstructed line of sight, FM, TV, and mobile phone antennas are often elevated on tall structures. The elevated placement of antennas helps to minimize obstacles and maximize the range of these signals.
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