Reaching The World entertainment PRESENTS Ground Zero Radio. GZR plays, promotes and shares House Music, EDM, and Top 40 Hits through all LIVE Mixes every Friday 6pm-8pm CST on WIIT 88.9 FM Chicago. If outside the Chicago-land area check us out through the FREE app. TUNEIN easily downloadable and search WIIT 88.9FM Chicago and take us with you wherever you go.