I have flown mostly in 172s that all have two communication
radios and two navigation radios. I have been accustomed to noting that there
were two communication radio antennas on top of the aircraft and what I thought
were two navigation radio antennas in a V-shape on the vertical stabilizer,
i.e. one antenna for each Nav radio. A few weeks back I was looking at a 152
and its antennas. The 152 had one comm radio and one nav radio. Correspondingly
it had only one comm antenna mounted on top of the aircraft but it still had
the two antennas on the vertical stabilizer in a V-shape. I originally thought
that maybe these antennas were installed in the case that an additional nav
radio might be installed. After doing some additional research I found that the
V shaped antenna is actually not two separate antennas but one antenna called a
dipole. The dipole is a specific design for an antenna that consists of two
identical elements that are joined in the center and feed a single radio or in
the case of the 172s with two nav radios the antenna feeds both nav radios.
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| Comm Antennas |
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| Nav Antennas |
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