"These sorts of alerts are not uncommon, but usually happen in
airports when someone has accidentally activated a transponder.
Most of these are false alarms, but we check them out anyway. By
morning, we had narrowed the signal to an apartment, and later to a
point on the wall of the apartment where the TV was located."
Source: Benton County (OR) emergency manager Mike
Bamberger, after discovering a flat-screen television that was
broadcasting on 121.5 MHz -- the emergency frequency commonly known
as "Guard." The TV belongs to a college student who's been told in
no uncertain terms to turn it off.