WNAX (AM)
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| City | Yankton, South Dakota |
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| Broadcast area |
Sioux City, Iowa Sioux Falls, South Dakota Omaha, Nebraska Lincoln, Nebraska |
| Branding | WNAX Radio 570 |
| Slogan | The Voice of the Midwest |
| Frequency | 570 AM (kHz) |
| Translator(s) | 99.9 K260BO (Yankton) |
| Format | Commercial; News/Talk |
| Power | 5,000 watts |
| ERP | 250 watts (FM translator) |
| Callsign meaning | None (sequentially assigned) |
| Affiliations | CBS |
| Owner | Saga Communications |
| Sister stations | WNAX-FM |
| Webcast | Listen Live |
| Website | WNAX.com |
WNAX (570 AM) is a radio station in Yankton, South Dakota, currently owned by Saga Communications, which broadcasts a News/Talk format. Due to the flat landscape of the upper Great Plains and the high ground conductivity of the terrain, plus WNAX's frequency near the bottom of the AM band, the station's 5,000-watt signal covers large portions of South Dakota, Nebraska, Iowa, Kansas, Minnesota, Missouri and North Dakota. Among U.S. stations its daytime land coverage is exceeded only by KFYR in Bismarck, North Dakota, and in addition to its home market of Sioux City and Sioux Falls, WNAX provides a strong grade B signal to Omaha and Lincoln. During the day, it can be heard as far south as Kansas City, as far north as Fargo and well east of Des Moines.
WNAX was first licensed on November 7, 1922 to the Dakota Radio Apparatus company, and is the oldest surviving radio station in the state of South Dakota. The call-letters came from a sequentially assigned list, and WNAX was the last station in the state to receive a callsign starting with a W instead of K (other than sister station WNAX-FM), as additional stations in the state were established after the January, 1923 shift that moved the K/W call letter boundary from the western border of South Dakota to the Mississippi River. WNAX was purchased by Gurney's Seed and Nursery Company in 1926 and became known as "WNAX—Voice of the House of Gurney in Yankton". The station was used to promote Gurney products and services, making Gurney's a household name.
On February 10, 1933, the Federal Radio Commission authorized an increase in daytime power from 1,000 watts to 2,500 watts. Less than two years later, December 18, 1934, the new Federal Communications Commission authorized another increase in power, to 5,000 watts.
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