Rader was promoted to the Steelers' active roster Tuesday, Teresa Varley of the Steelers' official site reports.
Rader was active in Week 9 against the Bears, making a one-yard catch on his only snap. The Youngstown State product has been with the team since 2019, appearing in one other game in 2020. With Eric Ebron (knee) likely to miss extended time, Rader will provide depth behind Pat Freiermuth and Zach Gentry.