Question: Where are the headquarters of Sky's rival?

Context paragraphs:
Sky Betting &amp; Gaming: Sky Betting & Gaming is a British-based gambling company, majority owned by CVC Capital Partners, with headquarters in Leeds, West Yorkshire and offices in Sheffield, London, Guernsey, Rome and Germany.  Sky Betting & Gaming consists of five core brands: Sky Bet, Sky Vegas, Sky Casino, Sky Poker and Sky Bingo.  It also owns online betting odds comparison site Oddschecker.  Sky Betting & Gaming also operates popular, free-to-enter football prediction game Soccer Saturday Super 6 and Sky Sports Fantasy Football.

Sky Financial Group: Sky Financial Group, Inc., was a diversified financial services holding company that operated in the Midwestern United States from 1998 until its 2007 acquisition by rival bank Huntington Bancshares.  Its largest subsidiary was Sky Bank, a commercial and retail banking company headquartered in Salineville, Ohio, that operated 330 financial centers and over 400 ATMs in Ohio, Pennsylvania, Indiana, Michigan and West Virginia.  Other wholly owned subsidiaries included investment, trust, and insurance services.

Sky Television plc: Sky Television plc was a public limited company which operated a nine-channel satellite television service, launched by Rupert Murdoch's News International on 5 February 1989.  Sky Television and its rival British Satellite Broadcasting suffered large financial losses and merged on 2 November 1990 to form British Sky Broadcasting (BSkyB).  Programming merger took effect on 1 December 1990.

Gold (UK TV channel): Gold (stylised as GOLD) is a British classic comedy channel from the UKTV network, broadcasting to the United Kingdom and Ireland.  It launched on 1 November 1992 as UK Gold, before, in 2008, it was split into current flagship channel Gold and miscellaneous channel, Watch, with comedy based programming now airing on Gold, non-crime drama and entertainment programming airing on Watch, and quiz shows and more high-brow comedy airing on Dave.  The channel is currently available as subscription-only on Sky, Virgin Media, TalkTalk TV, BT TV, and TVPlayer (When subscribed to TVPlayer Plus).  It shows repeats of classic programming from the BBC and other broadcasters.  The channel's main rival is the ITV plc owned ITV3, which mainly airs the archive ITV programmes, and has a higher audience share than Gold.  Another rival is More4 which also has a higher audience share than Gold.  This is because they are free-to-air channels whereas Gold is a pay TV channel.  On 1st December 2015 - 4th January 2016, Gold was temporarily rebranded as Christmas Gold.  This was repeated again from 12 November 2016 to 4 January 2017.

Celta de Vigo: Real Club Celta de Vigo (] ; "Royal Club Celta de Vigo"), commonly known as Celta Vigo or simply Celta, is a Spanish professional football club based in Vigo, Galicia, currently playing in La Liga.  It was founded on 23 August 1923 following the merger of Real Vigo Sporting and Real Fortuna Football Club.  Nicknamed "Os Celestes" (The Sky Blues), they play in sky blue shirts and socks along with white shorts.  The club's home stadium is Balaídos, which seats 29,000 spectators.  Celta's name is derived from the Celts who were once present in the region.  Its main rival is fellow Galician club Deportivo de La Coruña, with whom it contests the Galician derby.

Setanta Sports News: Setanta Sports News was a television channel from Virgin Media Television and Setanta Sports.  The channel launched on 29 November 2007.  as a rolling 24-hour sports news channel using the strength of the Setanta Sports brand across the United Kingdom and Ireland.  It was available to all Virgin Media customers and also free-to-view on satellite and online.  The channel was seen as Virgin Media's rival to Sky Sports News, which was removed from their platform on 1 March 2007 as their contract with British Sky Broadcasting had ended.  However, when Virgin Media reinstated Sky Sports News onto their television platform, their Setanta rival remained an active channel.

MAIR Holdings: MAIR Holdings, Inc. (NASDAQ: MAIR) was an airline holding company.  Later in its life its headquarters were in Fifth Street Towers II in Downtown Minneapolis, Minnesota.  At an earlier time its headquarters were on the property of Minneapolis-St.  Paul International Airport and in Fort Snelling, an unincorporated area in Hennepin County.  It was established in 1993 as Mesaba Holdings, Inc., to serve as the company for Mesaba Aviation, Inc., which operated Mesaba Airlines.  In 2002, MAIR also acquired Big Sky Transportation, Co., operator of Big Sky Airlines.

Virgin Media: Virgin Media plc is a British company which provides fixed and mobile telephone, television and broadband internet services to businesses and consumers in the United Kingdom.  Its headquarters are in Hook, Hampshire, United Kingdom.  The company has been a subsidiary of Liberty Global plc, an international television and telecommunications company headquartered in London, since June 2013.  Virgin Media previously had a primary listing on the NASDAQ Stock Market and was a constituent of the NASDAQ-100 index.  It also had a secondary listing on the London Stock Exchange.

2014 Montana Grizzlies football team: The 2014 Montana Grizzlies football team represented the University of Montana in the 2014 NCAA Division I FCS football season.  The Grizzlies were led by head coach Mick Delaney in his third and final year and played their home games on campus at Washington–Grizzly Stadium.  Montana participated as a member of the Big Sky Conference, of which they are a charter member.  They finished the season 9–5, 6–2 in Big Sky play to finish tied for second place.  They received an at-large bid to the FCS Playoffs where they lost in the second round to inter conference rival Eastern Washington.

V+: V+ (previously known as TVDrive) is a set-top box for Virgin Media's Virgin TV service, which provides personal video recording (PVR) and high definition (HD) functionality to customers who subscribe to the service.  Virgin TV have taken a different approach to rival Sky's Sky+ HD service, by implementing a rental scheme for the V+ Box.  When Virgin TV was launched, there was an installation charge (waived under certain circumstances) and a monthly charge for all customers with a discount for XL customers.  On 1 June 2007 pricing was revised, with all customers paying a one-off set-up fee and TV M and L customers paid a monthly charge, while TV XL customers had no extra charges.  Various deals to lower the set-up fee have been made available to all customers in order to compete with rival Sky.

Supporting paragraphs: V+ Virgin Media
Answer: Hook, Hampshire, United Kingdom