Where is the di-pole antenna for the VHF radio located?

Where is the di-pole antenna for the VHF radio located?

• A. Vertical stabilizer
• B. Wingtip
• C. Nose section
• D. Horizontal stabilizer

Answer: (A)

The VHF di-pole antenna is placed on the vertical stabilizer because mounting a dipole high on the tail gives a clean, relatively unobstructed radiator with minimal interference from the fuselage and tail surfaces. The vertical stabilizer provides a strong, unobstructed mounting point that keeps the two antenna elements effectively in place and maintains a stable radiation pattern needed for reliable VHF communication with air traffic control. Putting the antenna on the nose would bring it close to the engine and metal, detuning the element and degrading performance. A wingtip location is more typical for certain navigation or indicator antennas and can be more affected by wingtip vortices and airframe interference. The horizontal stabilizer can shadow or detune the antenna due to the tailplane itself, leading to inconsistent reception as you change pitch or angle.

The VHF di-pole antenna is placed on the vertical stabilizer because mounting a dipole high on the tail gives a clean, relatively unobstructed radiator with minimal interference from the fuselage and tail surfaces. The vertical stabilizer provides a strong, unobstructed mounting point that keeps the two antenna elements effectively in place and maintains a stable radiation pattern needed for reliable VHF communication with air traffic control.

Putting the antenna on the nose would bring it close to the engine and metal, detuning the element and degrading performance. A wingtip location is more typical for certain navigation or indicator antennas and can be more affected by wingtip vortices and airframe interference. The horizontal stabilizer can shadow or detune the antenna due to the tailplane itself, leading to inconsistent reception as you change pitch or angle.