ACDelco 25815079 GM Original Equipment OnStar, Digital Radio, Mobile Telephone, and GPS Navigation Roof Mounted Antenna ACDelco GM OE Antennas have signal strength, clarity, and signal interference protection Made with durable materials to withstand exposure to harsh weather and car washes GM-recommended replacement part for your GM vehicles original factory component Offering the quality, reliability, and durability of GM OE Manufactured to GM OE specification for fit, form, and function