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Conelrad question

Some of us are old enough to remember the old Conelrad(sic?) that predated
the EBS notification system. The emergency info would be transmitted at
either 640 or 1240 or the AM dial and all other stations would go off the

So...how exactly was this done....was there a special high power non
directional transmitter somewhere in Boston on 640/1240  and how was this
supposed to work in non urban areas?