The regional "Fan Sports Network" based at iHeartMedia's 100.3 KFXN Minneapolis is crossing the border east into Wisconsin. Red Rock Radio's 105.7 WXCX Siren, WI dropped its Variety Hits "Sam-FM" format for Sports "105.7 The Fan" on Wednesday. Northpine.com reports that it is the seventh of Red Rock's 25 stations to adopt a Sports format