The 110th floor of One World Trade Center ( the North Tower ) housed radio and television transmission equipment . The roof of the North Tower contained a vast array of transmission antennas , including the center antenna mast , rebuilt by Dielectric Inc. to support DTV in 1999 . The center mast contained the television signals for almost all NYC television broadcasters : WCBS-TV 2 , WNBC-TV 4 , WNYW 5 , WABC-TV 7 , WWOR-TV 9 Secaucus , WPIX 11 , WNET 13 Newark , WPXN-TV 31 and WNJU 47 Linden . It also had four NYC FM broadcasters : WPAT-FM 93.1 , WNYC 93.9 , WKCR 89.9 , and WKTU 103.5 . Access to the roof was controlled by the WTC Operations Control Center ( OCC ) , located in the B1 level of the South Tower . After the September 11 attacks of 2001 , the broadcasting equipment for the radio and television stations was moved to the Empire State Building
September 11 attacks
September 11 attacks
One World Trade Center