Permanently mount your signal booster antenna with the SureCall SC-203WN 3. 3 in. NMO Vehicle Antenna and 3/4 in. mounting base. NMO (Non-Magnetic Option) is ideal if a permanent mount is desired or your vehicle does not have a roof that allows for a magnetic antenna–such as those with an aluminum body. This antenna includes the NMO mounting base with attached 17 ft. cable for connecting the exterior NMO antenna to outside of the vehicle. It requires a 3/4 in hole to be drilled through a metal surface with the antenna outside and the mounting base inside the vehicle.