WBBM-TV shut down its analog signal, over VHF channel 2, on June 12, 2009, the official date in which full-power television stations in the United States transitioned from analog to digital broadcasts under federal mandate. The station's digital signal moved from pre-transition VHF channel 3 to the current, post-transition VHF channel 12. Through the use of PSIP, digital television receivers continued to display the station's virtual channel as its former VHF analog channel 2.1.
