A concise guide to high-performance Land Mobile Radio (LMR) systems, customized for crucial public safety and utility applications, explores Radio Access Networks (RANs) within LMR systems. It covers base stations, mobile radios, and portable radios that enable seamless communication through strategically placed base stations, antennas, and combining systems. The book addresses interference issues, emphasizing diagnostic and remedial approaches through field testing and redesign. It particularly focuses on the design intricacies of base station antennas and combining systems at shared radio repeater sites in densely populated areas. The book outlines methods for identifying interference sources and constructing interference-resistant base station antennas and combining systems, ultimately maximizing coverage and cost-effectiveness. It offers a comprehensive roadmap for designing interference resilient LMR systems that meet and exceed the needs of public safety and utility organizations during critical operations. This resource is essential for engineers, designers, and professionals involved in creating reliable and high-performance LMR systems.