The transition to digital TV won't just eliminate fuzzy pictures and crackling audio. The move to digital also enables the federal government to control the analog broadcast spectrum and reallocate it for other purposes. The government has designated a portion of this valuable spectrum to a unified national frequency that allows emergency organizations to communicate with each other. A single frequency will help public safety professionals (such as police, fire departments, and rescue squads) avoid the challenges they faced on 9/11, when communication was split between different bands. A portion of the spectrum has also been sold to wireless communications companies to provide consumers with more advanced services and technologies.