A search for copyright renewal was done at copyright.gov under the magazine’s title and the name of its publisher. There were no listings for either TV-Radio Mirror or Macfadden Publications. There’s no evidence of copyright renewal for the magazine.
Note that it may still be copyrighted in jurisdictions that do not apply the rule of the shorter term for US works (depending on the date of the author's death), such as Canada (70 years p.m.a.), Mainland China (50 years p.m.a., not Hong Kong or Macao), Germany (70 years p.m.a.), Mexico (100 years p.m.a.), Switzerland (70 years p.m.a.), and other countries with individual treaties.