In March, Senator John Kerry (D-MA) introduced the Radio Spectrum Inventory Act (S 649) in the Senate. Earlier this month, that bill passed the Senate Commerce, Science and Transportation Committee. Last week, Representative Henry Waxman (CA-30) introduced a companion bill — HR 3125 — in the House of Representatives; the bill has been referred to the House Committee on Energy and Commerce. The bills, if passed, would mandate an inventory of radio spectrum bands managed by the National Telecommunications and Information Administration (NTIA) and the Federal Communications Commission. The Senate version calls for an inventory of frequencies between 300 MHz-3.5 GHz managed by the two agencies, while the House bill would mandate an inventory of 225 MHz-10 GHz.