|Type||TV transmission tower (effective radiated power = 316 kW)|
|Location||Blanchard, Traill County, North Dakota, U.S.|
|Completed||13 August 1963|
|Design and construction|
|Main contractor||Kline Iron and Steel|
The KVLY-TV mast (formerly the KTHI-TV mast) is a 2,063-foot-tall (629 m) television-transmitting mast in Blanchard, North Dakota. It is used by Fargo station KVLY-TV channel 11 and KXJB-LD's Argusville/Valley City/Mayville translator K28MA-D channel 28.
Completed during 1963, it was the tallest structure in the world until succeeded by the Warsaw radio mast during 1974, which collapsed in 1991, again making the KVLY-TV mast the tallest structure in the world until the Burj Khalifa surpassed it in 2008. It was the fourth-tallest structure in the world (since the construction of the Tokyo Skytree and the Shanghai Tower), the tallest structure in the Western Hemisphere, and the second tallest broadcasting mast in the world. However in 2019, the top mount VHF antenna was removed for the FCC spectrum repack, dropping the height to 1,987 ft (605.6 m). 
The mast is located 3 miles (4.8 km) west of Blanchard, North Dakota, halfway between Fargo and Grand Forks. It became the tallest artificial structure, and the first man-made structure to exceed 2,000 feet (610 m) in height, upon the completion of its construction on August 13, 1963.
The tower was built by Hamilton Erection Company of York, South Carolina, and Kline Iron and Steel, and required thirty days to complete, at a cost of approximately $500,000 (roughly $4.23 million today). Construction was completed August 13, 1963.
Owned by Gray Television of Atlanta, Georgia, the tower broadcasts at 356 kW on channel 44 for television station KVLY-TV (channel 11 PSIP, an NBC/CBS affiliate) which is based in Fargo, North Dakota. The tower provides a broadcast area of roughly 9,700 square miles (25,000 km2), which is a radius of about 55.6 miles (89.5 km). Due to the spectrum repack, KVLY transmits on UHF channel 36 and maps to virtual channel 11 through PSIP. CBS/CW+ affiliate KXJB-LD's translator K28MA-D also broadcasts on this tower at 15 kW on UHF channel 28 (also its virtual channel).
When the mast was built the call letters of the television station for which it was built were changed to KTHI, the "HI" referring to the height of the mast. The top is reachable by a two-person service elevator (built by Park Manufacturing of Charlotte, North Carolina) or ladder.
The tower consists of two parts: a lattice tower of 1,950 feet (590 m); topped by the transmitting antenna array of 113 feet (34 m). The total height of both is 2,063 feet (629 m). The antenna weighs 9,000 pounds (4.1 t), the lattice tower weighs 855,500 pounds (388.0 t), giving a total weight of 864,500 pounds (392.1 t). It takes up 160 acres (65 ha) of land with its guy anchors. Its height above mean sea level is 3,038 feet (926 m).
Federal rule change
Some time after its completion, the Federal Communications Commission (FCC) and Federal Aviation Administration (FAA) imposed a policy that states, "Although there is no absolute height limit for antenna towers, both agencies have established a rebuttable presumption against structures over 2,000 feet above ground level." The FCC and FAA may approve a taller structure in "exceptional cases."
Structures of similar height
- Blanchard. "KVLY Tower". Structurae. Retrieved July 17, 2019.
- 1634–1699: McCusker, J. J. (1997). How Much Is That in Real Money? A Historical Price Index for Use as a Deflator of Money Values in the Economy of the United States: Addenda et Corrigenda (PDF). American Antiquarian Society. 1700–1799: McCusker, J. J. (1992). How Much Is That in Real Money? A Historical Price Index for Use as a Deflator of Money Values in the Economy of the United States (PDF). American Antiquarian Society. 1800–present: Federal Reserve Bank of Minneapolis. "Consumer Price Index (estimate) 1800–". Retrieved January 1, 2020.
- "ASR Registration 1046244". U.S. Federal Communications Commission.
- "N.D. TV Tower No Longer World's Tallest". All Things Considered. NPR.org. 5 January 2010. Retrieved 2011-12-06.
- "KVLY-TV Tower". Emporis. Retrieved 2011-12-06.
- "Info". Valleynewslive.com. Archived from the original on August 6, 2010.
- "Antenna Tower Lighting and Marking Requirements". Federal Communications Commission. Retrieved 2018-09-29.
|Wikimedia Commons has media related to KVLY-TV mast.|
- KVLY Tower at Structurae
- Tower web page at KVLY-TV
- "Listing 1046244". Antenna Structure Registration database. U.S. Federal Communications Commission.
- "KVLY-TV mast". SkyscraperPage.
- Drawings of KVLY/KTHI TV Mast from the Skyscraper Page
- KVLY and KXJB Towers from PBPhase.com
- Video of the KVLY Tower, summer 2009 from YouTube