WICA 91.5 FM began broadcasting on September 13, 2000. On a historical note, this call sign was used by a station in Northeastern Ohio until the mid seventies. At 4,000 watts, its signal does not have nearly the reach of WIAA, presumably to protect WMHW-FM in Mount Pleasant.
When WICA signed on, all NPR news and talk programming moved there from WIAA and its satellites. This left Cadillac, the second-largest city in IPR's coverage area, without a clear signal for most NPR programming. Partly to alleviate ths problem, Interlochen signed on WLMN in Manistee in August 2010. However, WLMN's signal doesn't reach Cadillac.
In the spring of 2011, a third IPR News Radio signal began operations with the sign-on of WHBP 90.1 FM in Harbor Springs, Michigan, expanding the network's reach to include the Petoskey, Charlevoix and Mackinaw City area.