=== USA ===
I [[USA]] blev de første tilladte FM-udsendelser foretaget på frekvenser mellem 25-27MHz (11-meter båndet), der blev kaldt '''Apex-båndet'''.<ref name="wrh"/> Den 18. marts 1934 blev W8XH i Buffalo, New York den første sendende apex-station.<ref>[https://fultonhistory.com/Newspaper%2024/Buffalo%20NY%20Evening%20News/Buffalo%20NY%20Evening%20News%201934/Buffalo%20NY%20Evening%20News%201934%2011844.pdf "WBEN Short-Wave Station To Begin Broadcasts Sunday"], ''Buffalo Evening News'', March 17, 1934, page 4. W8XH ended operations in July 1939.</ref><ref>[https://archive.org/details/1935RadioLogBuffaloEveningNewsBuffaloNY/mode/1up 1935 Radio Log Buffalo Evening News Buffalo NY]</ref> W1XOJ var den første eksperimentielle FM-[[radiostation]] med sin egen sendeplan, som fik tilladelse af [[FCC]] ([[Federal communications commission]]) i [[1937]] i [[USA]].<ref>"Apex Station On Its Own", ''Broadcasting'', Jan. 1, 1937. "[https://jeff560.tripod.com/fm1.html Milwaukee Station Using Apex Band Tells of Results]", ''Broadcasting'', May 15, 1937. W9XAZ eventually became WTMJ-FM, which was deleted in 1950. Nine years later a new WTMJ-FM was licensed; it is the current day [[WKTI-FM]] at 94.5&nbsp;MHz, [https://web.archive.org/web/20210128011731/https://jeff560.tripod.com/fm1.html backup].</ref>
Samfund Fysik Teknologi