Tonight I drove through Knoxville and heard WQBB AM 1040 on the air after midnight. I thought they were daytime only as they are on WHO Des Moines' channel. Their signal was terribly distorted and barely listenable, but they were running MOYL and promos that clearly identified them. I checked fcc.gov and they are shown to run at 3kw during critical hours. But midnight must be long after critical hours. Was this maybe some sort of engineering test or are they actually staying on all night?