A 145mm magnetic antenna base with SO-239 socket, supplied with a 4m coax cable. The 145mm base sits between the compact 90mm and the large 170mm turbo in terms of footprint and magnetic hold — a good all-round choice for standard CB and mobile antennas on a steel vehicle roof or panel.The SO-239 socket accepts any antenna with a PL-259 connector — compatible with the vast majority of CB and mobile antennas. The 4m cable gives sufficient reach from roof to radio for most vehicle installations.For other sizes in the SO-239 magnetic base range: 90mm SO-239 Magnetic Base 170mm Turbo SO-239 Magnetic Base Key Features Magnetic base diameter: 145mm Socket: SO-239 (UHF female) Cable length: 4m No drilling required Compatible with CB, VHF/UHF, and HF mobile antennas with PL-259 connector