WTTN is the sacrifical lamb to allow WTLX to get a better signal to Madison. It's all because of the FCC's strange rulemaking process, which pretends that stations primarily serve their community of license and that moving the license would always be a loss to the community.
In reality, WTLX Columbus already targets Madison, er, Monona. Watertown will lose its only real local radio station, WTTN, to Columbus. That's OK under FCC rules because WJJO/94.1 will remain licensed to Watertown, though it's really a Madison station.