Strongest AM radio stations in Portage: 1  WPDR (1350 AM; 1 kW; PORTAGE, WI; Owner: ZOE COMMUNICATIONS, INC.) 2  WNAM (1280 AM; 50 kW; NEENAH-MENASHA, WI; Owner: CUMULUS LICENSING CORP.) 3  WSPT (1010 AM; 50 kW; STEVENS POINT, WI) 4  WTMJ (620 AM; 50 kW; MILWAUKEE, WI; Owner: JOURNAL BROADCAST CORPORATION)