From chicagoblackhawks.com: (link)
Chicago Blackhawks radio broadcasts for the team’s games on April 7 (at Nashville, 7:00 P.M.) and April 8 (vs. Columbus, 7:30 P.M.) have been switched to WIND-AM (560) due to a conflict on the flagship station, News/Talk 720 WGN Radio. Veteran broadcasters John Wiedeman and Troy Murray will still handle the call of each contest.
All other remaining regular-season games can be heard on News/Talk 720 WGN Radio. Along with listening to the radio broadcast, Blackhawks fans can watch both the April 7 and 8 games on Comcast SportsNet, with the call from Pat Foley and Eddie Olczyk, as regularly scheduled.