Clearing Broad Airwaves for New Deployment Act or the C-BAND Act This bill requires the Federal Communications Commission (FCC) to make between 200 and 300 megahertz of C-Band spectrum available for reallocation and the assignment of licenses through a system of competitive bidding. C-Band spectrum is electromagnetic spectrum between the frequencies of 3700 and 4200 megahertz. Such spectrum shall be for the provision of broadband internet access service, and the clearing and reallocation shall take place in a manner that ensures C-Band-dependent users (1) receive equal or better service than was previously available, and (2) receive such service continuously throughout the transition process. In addition, specified proceeds from such spectrum auctions shall be made available to the FCC for the build out and maintenance of rural broadband infrastructure in unserved rural communities.