Where on the aircraft would you expect to find a DME antenna?

The DME (Distance Measuring Equipment) antenna is typically found on the bottom of the fuselage of an aircraft. This placement is strategic for several reasons. Positioning the DME antenna on the underside allows for unobstructed reception of signals from ground-based DME transmitters, which are often located near airport facilities. This orientation helps ensure a clear line of sight and optimum performance since any obstructions from the airframe or other structures are minimized during operation.

This placement also allows the antenna to remain shielded from some environmental factors, such as turbulence and airflow disturbances caused by the wings and tail, which can affect signal quality. Consequently, the underside location is ideal for maximizing the performance and reliability of the DME system, which is crucial for pilots relying on accurate distance information during navigation and approach phases.