In a recent Daily Herald article they quoted Nextar officials concerning WGN AM:

But Johnson said plans now call for four data center buildings on a larger portion of the property. He said Nexstar officials told him they can do without the old towers and are able to handle radio transmission in other ways these days.

Officials at the Irving, Texas-based company that acquired the 50,000-watt AM station in 2019 wouldn’t detail future plans, but assured listeners they would not lose service to WGN radio over the air and online.

Here is a link to the full article:

https://www.dailyherald.com/20260128/news/elk-grove-village-extends-deadline-to-build-data-centers-at-wgn-transmitter-site/

Additionaly, about a week ago WGN applied with FCC to slightly correct their transmitter coordinates. Not sure what all this means concerning the future of the WGN transmitter site.