Definition
An antenna; a conductor, or system of conductors, used to radiate or receive radio-frequency energy. The term may also be used as an adjective meaning 'of, in, or pertaining to the air.'
Plain English
A piece of wire or metal designed to send or pick up radio signals. As an adjective, it simply means 'in the air' or 'having to do with the air.'
Context Anchor
Seen in phrases such as aerial inspection, aerial application, aerial photography, and aerial navigation.
Derivation
From the Latin 'aer' meaning 'air.' The radio-equipment sense came from the idea of a wire reaching up into the air to catch invisible signals — literally an 'air wire.' Today most pilots and engineers say 'antenna' instead, but 'aerial' still appears in older texts and British usage.
Why Pilots Care
Knowing that 'aerial' and 'antenna' refer to the same thing prevents confusion when reading older maintenance manuals, equipment placards, or British-authored material.
Intuition Check
Aerial does not simply mean “high up,” and in this aviation use it does not mean a radio antenna. It means connected with the air, flight, or an aircraft-based activity.
Example Sentence 1
The mechanic inspected the aerial mounted on top of the fuselage for corrosion before signing off the radio repair.
Example Sentence 2
Aerial mapping flights require stable weather and precise navigation.