This 4-inch horizontal mirror mount bracket with SO-239 stud is the perfect solution for those who want to install a mobile/vehicle antenna. It is designed to fit all your communication needs and is compatible with various types of antennas. The bracket is made of high-quality materials and is built to last, ensuring that your antenna remains secure and stable during communication. Whether you're a professional truck driver or a recreational vehicle owner, this mount bracket is an essential accessory for your communication system. It is easy to install and use, and its compact design makes it easy to transport. With this mount bracket, you can be sure that your antenna is always secure and that you can communicate with ease.