On January 7, 2021, Sinclair began simulcasting WTTE's main signal onto WSYX 6.3, as part of Columbus' adoption of ATSC 3.0. The next day, Sinclair announced that WSYX was now a dual ABC/Fox affiliate while WTTE was now a primary affiliate of Sinclair-owned TBD (moving over from 28.2), quietly moving WTTE's intellectual property including its main programming and Fox affiliation to WSYX permanently. WTTE thus became the third station to have TBD as a primary affiliate and the fourth Sinclair-controlled station to have one of Sinclair's netlets as a primary affiliate, joining fellow TBD affiliates WXBU in Lancaster, Pennsylvania (serving Harrisburg) and KENV-DT in Elko, Nevada (a submarket of the Salt Lake City market), and Stadium affiliate KTXD-TV in Greenville, Texas (serving Dallas–Fort Worth); like WTTE, all of the aforementioned stations except KTXD-TV once had a primary affiliation with a major network.