Prepare For Contact

Here's a 1924 telegram from then Chief of U.S. Naval Operations, Edward W. Eberle, instructing all Naval stations to monitor the airwaves for any unusual transmissions due to anticipated contact from Martians. August 22nd of that year was witness to the closest Mars opposition since 1804 (a mere 55,777,566 km), and as such provided desirable conditions in which to receive radio signals from the Red Planet. The man tasked with clearing the airwaves - a Professor David Todd - somehow managed to persuade both the Army and Navy to report any findings for a three day period, but failed to silence the country's private radio broadcasters for even two days. Needless to say, the three day exercise produced nothing but static.
 
Popular Radio Magazine ran with this ad prior to the opposition. Let me know if you have one of higher quality.

Source

Transcript

WASHINGTON-ALASKA MILITARY CABLE AND TELEGRAPH SYSTEM
TELEGRAM

RECEIVED AT 1308 1ST AVENUE, SEATTLE, WASH.

18RD B 78 GOVT DUPE

RD PUGETSOUND WN AUG 22 1924

GOVT COMDT 13 NAV DIST

SEATTLE WN

7021 ALNAVSTA EIGHT NAVY DESIRES COOPERATE ASTRONOMERS WHO BELIEVE POSSIBLE THAT MARS MAY ATTEMPT COMMUNICATION BY RADIO WAVES WITH THIS PLANET WHILE THEY ARE NEAR TOGETHER THIS END ALL SHORE RADIO STATIONS WILL ESPECIALLY NOTE AND REPORT ANY ELECTRICAL PHENOMENON UNUSUAL CHARACTER AND WILL COVER AS WIDE BAND FREQUENCIES AS POSSIBLE FROM 2400 AUGUST TWENTY FIRST TO 2400 AUGUST TWENTY FOURTH WITHOUT INTERFERRING WITH TRAFFIC 1800

SECNAV WASHN DC

257P