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In New Orleans, there was no audio on the TV (OTA). The "point of entry" station, WWL-AM, was understandable but much like wa2ise described, poor quality. The other AM stations retransmitting WWL's feed were unintelligible.
When the "EAS" was activated over the "EBS" (late 90's?) the FCC mandated that stations feed their signals through the EAS control unit en route to the transmitter, taking away the engineers' control. When I was in radio, the EBS system was totally manual - from what I remember: an alert came over the wire with a codeword, which you physically checked against a monthly list, before switching to the EBS feed. (I seem to remember something about cutting the transmitter on and off twice, but am probably mistaken about that.)
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