So I happen to see this youtube video and what struck me first was the (K) in the KOKA call sign and the location.. I thought it would of still started out with a "W" so i go and try and google the call KOKA and I get nothing but searching KOKA CBS ended up saying KDKA.. however I don't see anything about a call sign change?
*edit found this
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topics.info.com/How-are- ··· ions_997but still confused how they went from KOKA to KDKA