3.5" Magnetic Mount. The PCTEL Maxrad PCTMAG-HD magnetic mount is a NMO type mobile antenna mount that offers removability with no tab. No drilling into your vehicle is required for installation making the location of the magnetic mount easy to adjust. The vehicle antenna mount thread size is 1 1/8 in-18. This PCTEL black magnet mount for mobile antennas operates within 0 – 8000 MHz and includes 15 ft of Pro-Flex Plus 195 cable with TNC Male connector is installed, or choose connector installed.