The HD2 channel and companion online stream would later be re-branded as "XpoNential Radio". In 1970, WXPN-AM's operations moved from Houston Hall, directly in the center of campus, to 3905 Spruce Street. The FM radio station became professionally run by 1980, with a mix of community volunteers and students staffing the station, while the AM radio station was still student-run. WXPN-AM then became WQHS, which stands for Quad Hill Superblock (referring to student dormitories on campus). As of September 2005, the radio station is located on the 5th floor of the Hollenback Center, on the far east side of campus. In 2003, the WQHS radio tower, formerly on top of Harnwell College House, fell in a severe storm. As a result, WQHS now broadcasts exclusively over the Internet, in an eclectic freeform radio format.