Radio CHXX X2 (CKNU-FM)

CHXX-FM is a French-language Canadian radio station located in Quebec City, Quebec, and licensed in Donnacona, Quebec.

Owned and operated by RNC Media, it broadcasts on 100.9 MHz with an effective radiated power of 3,100 watts (class B) using an omnidirectional antenna. The station also has one rebroadcaster, operating on 105.5 FM in Lotbinière.

Under its former call sign CKNU, the station had a classic rock format and was largely automated. It was best known for having been the home of controversial host André Arthur from August 2002 until December 2005. RNC Media fired most employees, including Arthur, after it acquired the station from Genex Communications in December 2005.

As of July 31, 2007, CKNU changed its call name to CHXX-FM and became Radio X2, an alternative rock radio station similar to its sister alternative rock station Radio X (CHOI-FM, which is now a news-talk station).