WNAX

AM 570 WNAX (W North American Radio EXperiment) is a News/Talk station licensed to Yankton, South Dakota.  The 5000-watt signal of "Your Big Friend" covers portions of South Dakota, Minnesota, Iowa, Nebraska and Kansas and boasts the second largest daytime land coverage area of any US station (thanks to flat land and ideal ground conductivity.)  WNAX signed on the air in 1922. Twenty years later they constructed an 800+ foot tower making it the tallest radio stick in the country at the time (it's still the tallest AM tower).  In the late 1920s Lawrence Welk began performing on the station without pay and continued to do so for 10 years.  Wynn Hubler Speece aka "Your Neighbor Lady" started her household hints and recipes show in 1939 and continued for almost 66 years.