The one place I know in WI is on the river that there are no signs for NO WAKE posted anywhere, but there are signs on every lake in the state saying NO WAKE, mostly by the landing areas or areas where the lake is to shallow.
That guy must not have lived in WI to long or have been on too many lakes around here
Even way up in the northern parts of the state by three lakes, which is the world's largest chain of inland lakes, there are NO WAKE signs in the channels between them