I wish I still had a radio old enough to have the two little symbols on the AM dial that marked the two CONELRAD frequencies (640 and 1240 IIRC). The idea was that in the event of a Soviet nuclear attack, all stations would switch to those two frequencies so the bombers couldn’t use a broadcast signal as a navigation beacon to their targets like the Japanese did at Pearl Harbor. ICBMs made that obsolete pretty quickly. (I remember air raid drills in elementary school in the ’50s, but I never ducked and/or covered.)
I wish I still had a radio old enough to have the two little symbols on the AM dial that marked the two CONELRAD frequencies (640 and 1240 IIRC). The idea was that in the event of a Soviet nuclear attack, all stations would switch to those two frequencies so the bombers couldn’t use a broadcast signal as a navigation beacon to their targets like the Japanese did at Pearl Harbor. ICBMs made that obsolete pretty quickly. (I remember air raid drills in elementary school in the ’50s, but I never ducked and/or covered.)