Motorized radio antennas were a popular automotive feature that automatically extended when the car's radio was turned on and retracted when it was turned off. This feature has largely been discontinued by car manufacturers in favor of more modern, integrated antenna designs.

Description and Operation: A motorized power antenna is an electrically operated telescopic mast that moves up and down.

Function: It was designed to provide good AM/FM radio reception by extending to an appropriate length for the wavelengths being received, while also offering the convenience of a fully retractable antenna that wouldn't get damaged in car washes or by vandals.

Activation: The antenna's motor was typically controlled automatically by the power signal from the radio unit or the ignition switch. Some systems also included a manual override switch on the dashboard.

Components: The system included a motor assembly, a plastic or stainless steel mast, a drive cable, and a mounting base with a drain tube.

Reason for Discontinuation: Automakers began phasing out external motorized antennas around the early 2000s, with some models like the Cadillac Eldorado using them until roughly that time. The discontinuation was driven by several factors:

Aesthetics and Aerodynamics: Automakers moved toward sleeker vehicle designs, using integrated antennas that are hidden within the vehicle's body, such as in the windshield or rear glass, or in low-profile "shark fin" modules on the roof. These designs reduce wind resistance and noise.

Durability and Damage: External masts were prone to damage from car washes, weather, and vandalism. Integrated systems are protected within the vehicle's structure.