This vehicle roof radio antenna base serves as a direct aftermarket replacement for factory part number 28216BC20A, designed to fit compatible vehicles produced between 2001 and 2010. It acts as the mounting foundation for roof radio aerials, securing the antenna firmly on the vehicle roof while maintaining stable radio signal transmission. Constructed from high-strength weather-resistant plastic, this aerial base withstands long-term exposure to sunlight, rain and temperature changes, resisting cracking and aging during daily use. Built with built-in threaded metal fitting and conductive contact structure, it ensures reliable electrical connection between antenna and vehicle radio system. This replacement base is an ideal solution for worn, cracked or leaking original antenna bases. Damaged factory antenna bases often lead to loose aerials, poor radio reception or roof water leakage. Simple installation eliminates the need for complex modification work. It strictly follows original equipment structural specifications for precise matching, ensuring seamless installation without roof panel modification. The sealed base structure effectively prevents rainwater penetrating into the vehicle interior. This component only includes the antenna base, external antenna rod is not included. Suitable for daily passenger vehicle maintenance and repair. It restores original radio receiving performance and protects your vehicle roof from corrosion caused by damaged antenna mounting points. Professional installation is recommended to guarantee stable mounting and waterproof performance after assembly.