How are VHF and UHF RFs similar?

• A. Both use satellites.
• B. Both line of sight.
• C. One is line-of-sight, the other is not.
• D. Both require no power.

Answer: (B)

VHF and UHF signals primarily propagate as line-of-sight transmissions. Because their wavelengths are short, these bands don’t rely on ionospheric reflection for long-range reach the way lower frequencies do; instead, a clear path between transmitter and receiver is needed. Obstacles like hills or buildings can block or attenuate the signal, and ranges are largely set by transmitter power, antenna height, and receiver sensitivity. While both bands can be used with satellites in some systems, that is not inherent to their similarity, and the statement about requiring no power is false since transmitting and receiving require power.