later in 1955 as that network was winding up operations, and lost ABC in 1959 when KXGO-TV (channel 11, now KVLY-TV) signed on. In 1983, WDAY-TV swapped affiliations with channel 11, then known as KTHI-TV, and became an ABC affiliate. Although it was apparent that Fargo and Grand Forks were going to be a single market, channel 6 did not cover the northern portion of this vast market very well. It was required to conform its signal to protect CBC Television's Winnipeg station, CBWT, which took to the air on channel 6 a year after WDAY-TV signed on. As a result, it was barely viewable in northern Grand Forks and could not be seen at all in much of the northern part of the market. To solve this problem, it signed on WDAZ-TV in 1967 as a semi-satellite for the northern portion of the market. WDAY-TV and WDAZ-TV began operating cable-only WB affiliate "WBFG" in 1998. WDAY/WDAZ replaced The CW Plus successor of "WBFG" with the Justice Network (which moved from 6.4) on new digital broadcast subchannels WDAY 6.2 and WDAZ 8.2 on September 12, 2016 and WDAY'Z Xtra (which launched in 2013) on digital subchannel 6.3 in the Fargo area and 8.3 in the Grand Forks area. WDAY-DT4 returned to the air in 2017 as an affiliate of Ion Television. WDAY-TV is one of the westernmost stations in the country whose call sign begins with W. Most stations west of the Mississippi River begin with K; however, WDAY radio signed on in 1922, a year before the U.S. government moved the K-W boundary from the state borders between 102 and 104 degrees West longitude (including the North Dakota–Montana border) to the Mississippi River. WDAY Xtra WDAY Xtra is a digital subchannel carried on WDAY 6.3, WDAZ 8.3, KBMY 17.3, and KMCY 14.3, airing as a primary affiliation to MyNetworkTV on KBMY and KMCY but independent without interruption on WDAY-TV and WDAZ-TV.⁴ This subchannel airs syndicated programming, North Dakota and Minnesota high school sports, North Dakota high school state tournaments, Minnesota State University Moorhead athletics, and select University of North Dakota athletic events. It airs Doppler weather radar and "Storm Tracker" weather loop with easy listening music during overnights. WDAY Xtra is carried on all cable providers in the coverage area. WDAY Xtra became available in HD in 2014, and in 2016, MyNetworkTV programming began airing in prime time, although