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Vehicle antennas and antenna components handle AM/FM reception, satellite radio signals, and in some cases OnStar or remote keyless entry communication. The most common failure points are the antenna mast — the threaded or snap-fit rod that extends above the roof or fender — and the power antenna mechanism, which uses a small nylon rack and motor to raise and lower the mast automatically. Masts corrode, snap off in car washes, or strip their drive teeth over time. Power antenna assemblies typically last 8–12 years before the motor or rack fails. When shopping, verify fitment by year, make, and model — mast thread pitch and base mount diameter vary significantly across manufacturers. OEM replacements guarantee a precise fit, while quality aftermarket masts from brands like Metra or Votex are cost-effective for older vehicles where OEM parts are discontinued. Antenna base covers are often overlooked but prevent water intrusion into the fender cavity.

Signs you need replacement

• Poor or staticky AM/FM reception — A corroded, bent, or broken mast reduces signal quality noticeably. If reception degrades suddenly, inspect the mast for physical damage or rust at the base.
• Power antenna doesn't extend or retract — If the mast stays down when the radio is on, or won't retract when the ignition is off, the nylon drive rack inside the assembly is likely worn or the motor has failed.
• Grinding or chattering noise from the fender — A power antenna making noise during operation usually means the drive rack teeth are stripped or debris has entered the mast tube. Continuing to run it will burn out the motor.
• Mast is snapped off or visibly bent — Physical damage from a car wash, vandalism, or impact requires immediate mast replacement to restore reception and prevent water from entering the antenna base.
• Water leaking into the trunk or headliner near the antenna mount — A cracked or missing antenna base cover, or a loose base gasket, allows rainwater to track down the antenna lead and into the vehicle interior.

Frequently asked questions

• How do I know if I need just the mast or the full power antenna assembly? If the motor runs but the mast doesn't move, the nylon rack inside the mast is stripped — replace the mast only. If the motor is silent or the assembly hums without movement, the motor has failed and you'll need the full power antenna assembly, typically $30–$90 depending on vehicle.
• Are aftermarket antenna masts worth buying, or should I stick with OEM? For most daily drivers, quality aftermarket masts are a practical choice — they typically run $10–$25 versus $25–$60 OEM, and fit well on common platforms. For newer vehicles still under warranty or those with integrated amplified antennas, OEM is worth the premium to avoid signal issues or fitment headaches.
• Is replacing a power antenna something I can do myself, and what else should I replace at the same time? Most power antenna replacements are DIY-friendly — expect 45–90 minutes, basic hand tools, and access through the inner fender or trunk liner. While you're in there, replace the antenna lead cable if it's cracked or corroded. A new base gasket is cheap insurance against leaks and costs under $5.