A renewal search was done in publications for the years 1970 and 1971. There was one renewal for Radio Mirror-the January 1944 issue. This is the February 1943 issue; there's no evidence of renewal for this issue.
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.
{{Information |Description=Photo of Charles Flynn as Jack Armstrong, 1943. |Source=[http://ia801500.us.archive.org/BookReader/BookReaderImages.php?zip=/16/items/radiomirror00mac/radiomirror00mac_jp2.zip&file=radiomirror00mac_jp2/radiomirror00mac_0139.j...