Definition
External metal devices mounted on an aircraft that transmit and receive radio signals for communication and navigation. Because they are conductive and often protrude from the airframe, they are common attachment and exit points for lightning strikes.
Plain English
The metal rods, blades, or wires on the outside of an airplane that send and receive radio signals. They are also one of the spots where lightning is most likely to enter or leave the aircraft.
Context Anchor
Seen in aircraft systems discussions, preflight inspections, communication and navigation equipment, and lightning strike protection sections.
Derivation
Antenna comes from the Latin word for a sailing ship's yardarm — the long horizontal pole that held the sail. Early radio inventors borrowed the term because the first wire antennas looked like those poles sticking out from a structure.
Why Pilots Care
Antennas are typical lightning entry and exit points. Damage from a strike can interrupt communication or navigation, so a post-strike inspection of every antenna is essential before flying again.
Grounding Statement
On many aircraft, a radio antenna is a small blade, wire, or rod on the outside of the airplane that connects the aircraft’s radios to signals in the air.
Intuition Check
Do not think of an antenna as just a visible stick on the aircraft. In aviation, a radio antenna is any designed part of the aircraft’s radio system that sends or receives signals, and it may also be part of the lightning protection plan.
Example Sentence 1
After the lightning strike, the mechanic inspected each of the radio antennas on the fuselage for burn marks or pitting.
Example Sentence 2
After a lightning strike the technician inspected the radio antennas first because they often carry the initial current.