The legendary WLS call letters represent not only one of America's leading talk stations, they also reflect the pioneer status as one of the first major radio stations to serve the midwest. The call letters stand for World's Largest Store (relecting original owner, Sears, Roebuck and Company). WLS is the only station in the nation whose entire lineup of weekday hosts (Don Wade & Roma, Erich “Mancow” Muller, Pat Cassidy, Rush Limbaugh, Roe Conn, Sean Hannity, Mark Levin and George Noory) are counted among the Talkers Magazine "Heavy Hundred". The station operates on an AM clear channel frequency of 890 kHz with a power of 50,000 watts, with a nighttime signal that reaches 38 states.