In article , says...
In article , (Gene Seibel) wrote:

Do you remember what the specific requirements were back in the days of
conelrad?

If we're talking FM stations, I don't know for sure but I think the
FMers (what few there were) would have had to sign off. The
participating am stations all switched to one of two frequencies (1 high
or 1 low) theoretically to confuse enemy "signal tracers" from seeking
and destroying transmitters.
I must admit Conelrad was way before my time so I am speaking from
"book memory". I hit radio during EBS when the alerts were kill carrier
for 5 seconds, back on for 5, off for 5, then back on with a 1khz tone
(or at least I think that's how it went).

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