Searches were done for renewals in publications for the years 1977 at UPenn and at copyright.gov for 1978, There were no listings for Radio and Television Mirror. There's no evidence Macfadden continues to claim copyright on the material.
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.