WAAT changed its call letters to WNTA in 1957 primarily to reflect a shift in ownership and programming focus. The station, which was originally established in 1947, underwent a transition that aligned its branding more closely with its new management and the type of content it was delivering to its audience.

The change to WNTA was part of a broader trend during that era where many stations rebranded themselves to better fit their evolving identities and market strategies. This rebranding often included a change in music format, target demographics, and overall programming philosophy.

If you would like more detailed information or specific historical context regarding the station's programming changes or ownership transitions during that time, please let me know!