W3XK is often claimed to be the oldest television station in the United States, possibly in the entire world. It was operated by Charles Jenkins of Charles Jenkins Laboratories from July 2, 1928 to 1934. The station's frequency started out at 1605 kHz, but moved to 6420 kHz (6.42 MHz), and eventually moved to 2.0-2.1 mHz. It broadcast from Wheaton, Maryland (just outside of Washington, DC, first with a 48 lines picture, then with 60 lines.