On August 31, 1998, the station became a charter affiliate of Pax TV, and changed its call letters to the current WZPX-TV. One year later, on August 31, 1999, UPN programming moved to Grand Rapids-based WXSP-CA (channel 15). On October 6 of that year, WZPX became a secondary affiliate of The WB. UPN would later find an affiliate in Lansing on WHTV (channel 18) on October 16, 2000. During this time, the network's Detroit owned-and-operated station WKBD-TV was carried as an out-of-market signal on local cable providers. In 2000, when the FCC relaxed its ownership rules to allow ownership of stations with overlapping coverage, Paxson repurchased the station outright.