However as of June 19, 2008; Arbitron has expanded Oklahoma City's market definition allowing Citadel to own 5 FM stations in the said area, at which time Citadel Broadcasting applied to re-acquire KKWD from The Last Bastion Station Trust, LLC with the Federal Communications Commission (FCC).
From mid-2004 until the introduction of Arbitron's Portable People Meters (PPMs) to the Chicago radio market in mid-2008, WGCI was the #1 music station and overall radio station in the Chicago radio market.
Nevertheless, the station had a devoted audience, and its ratings were not largely adversely affected by Detroit's switching from Arbitron's diary system to the Portable People Meter PPM.
The format change was likely done due to the introduction of Arbitron's Portable People Meter audience measurement system in the month of June into the Milwaukee market.
Fowler and his morning-show competition at WFLA (first Jack Ellery, then Dick Norman) swapped ratings victories, while Bob Lassiter won his timeslots in every Arbitron ratings book with double his competitors' numbers before departing for WFLA in September 1987.
Mediabase & Arbitron now report WQBK-FM/WQBJ as an active rock station, replacing WZMR; while Nielsen BDS reports the station on the mainstream rock panel as of 2012, meaning active rock was pretty much replaced by mainstream rock on this station.
Since the advent of the Portable People Meter by Arbitron in Philadelphia, WXTU has become the most listened to country station in the United States (based on listener cume).