Its original call sign was KAYN, broadcasting on 98.3 MHz as the first FM radio station in Nogales, Arizona.
The construction permit was granted over the objections of KFBR, the only other American radio station serving the border area.
In April 2002, Tucker was approved to move KZNO from 98.3 in Nogales to 98.5 in Vail, Arizona, increasing its ERP to 3,900 watts.
According to a U.S. Federal Communications Commission (FCC) filing in 2006, the station was unable to maintain a reliable power supply.
In June 2010, KRDX was granted an FCC construction permit to change the city of license to Corona de Tucson, Arizona, and move to 103.7 MHz, which would end its long-time interference with KOHT.