Spectrum is a limited national resource that enables our digital world. Mobile broadband services rely on these invisible airwaves to function, making spectrum indispensable to bridge connectivity divides. It also supports the provision of wireless services across the economy, from education to healthcare to industry, and enables applications such as satellites, GPS and the Internet of Things. Spectrum must be efficiently managed to achieve broader social and economic goals. As such, the stakes of spectrum management decisions are high and the challenges complex. This report discusses the effective stewardship of this essential asset in the context of wireless communication services, presents trends in policy, and discusses future considerations for management. It finds that well-designed and transparent licensing regimes, including auctions, foster investment and innovation, and that flexible frameworks (e.g. sharing or unlicensed spectrum) can promote efficient use.