The Spectrum Coordination Act aims to significantly improve federal coordination in the management of radio frequency spectrum. It achieves this by amending the National Telecommunications and Information Administration Organization Act, establishing new and more transparent procedures for interagency communication regarding proposed spectrum actions. These procedures are designed to ensure that federal entity concerns are formally considered and publicly documented during the spectrum reallocation process. Specifically, for any proposed spectrum reallocation by the Federal Communications Commission that could impact federal entities, the Assistant Secretary of Commerce for Communications and Information must publicly file details of federal entity concerns, including technical, procedural, or policy issues. When the Commission issues a final rule, it must publish an interagency coordination summary explaining how these concerns were resolved. Additionally, the bill mandates that the Federal Communications Commission and the National Telecommunications and Information Administration regularly update their Memorandum of Understanding every three to four years to reflect evolving technological and policy circumstances.