The only license in the FCC's own database is:
Callsign: WNRW412
Licensee: MILWAUKEE REPEATER SERVICE INC
ALLENTON, WI.
Radio Service:IG
Status:Active
Grant Date:6/25/2002 1:00:44 AM
Expiration Date:6/25/2012 1:00:44 AM
Frequency Assigned: 0000463.32500000
=====================================
You didn't mention if it is a repeater or not, so
whoever it is, is either running illegal or renting bandwith from the licensee... (?)