Note: the antenna is compatible with most cars, but does NOT fit Jeep Grand Cherokee / Renegade / Wrangler JL, Mazda mx-5 and Ford Fusion. Package Includes: 1pc car radio antenna, 3pcs threaded adapters (M4, M5,M6). Flexible Mast: external part is made of quality rubber, the car antenna can not be broken easily even bent in different arcs. Easy to Install: unscrew the old antenna, pick correct size threaded adapter, screw the new antenna right into the existing roof mount or antenna base with the adapter. Improve Radio Reception: 16 inches long, making of high quality internal copper coil, the antenna can get better signal reception, which enables you pick up more clear stations. Antenna Mast Replacement: fits most vehicles with 3 alternate screw adapters, a good choice to replace old or broken roof mounted antennas on cars, trucks, tractors, hatchbacks, SUV, camper.