The FCC’s new rules for HD Radio expansion will take effect on November 20, 2024, allowing FM stations to operate their upper and lower digital sidebands at different power levels without needing annual experimental authorization. This change aims to improve digital signal penetration, particularly in urban areas with dense populations and tall buildings. However, stations on frequencies between 107.1 to 107.9 MHz are temporarily excluded due to concerns about potential interference with aviation systems. The FCC will continue monitoring interference and maintain existing mitigation procedures while allowing stations to increase digital power within regulated limits.