By Sara Sjolin, MarketWatch

LONDON (MarketWatch) -- The U.K.'s FTSE 100 index was on track to break a six-day losing streak on Monday, with Vodafone Group PLC boosting the benchmark after merger news and with mining firms tracking metals prices higher.

The FTSE 100 index advanced 0.4% to 6,556.11, following a weak sentiment last week. The benchmark on Friday closed with the biggest weekly loss since June last year, while the six days mired in the red marked the longest losing run since November 2011.

In Monday's trade, heavyweight Vodafone (VOD) helped lift the FTSE, rising 1.4% after the telecoms firm reached an agreement to buy Spanish cable operator Ono SA for just over 7 billion euros ($9.7 billion), including debt. The deal follows weeks of negotiations and will be announced later on Monday, according to people familiar with the matter.

Miners were also among major advancers, as most metals prices managed to push higher. Anglo American PLC added 2.2%, BHP Billiton PLC (BHP) gained 1.4%, and Rio Tinto PLC (RIO) put on 1.1%.

Shares of Glencore Xstrata PLC rose 3.1% after people close to the matter said the mining major was close to reaching an agreement on the multibillion-dollar sale of its Las Bambas Peruvian copper project to a Chinese consortium.

Outside the main index in London, home builders had a positive trading day after U.K. Chancellor of the Exchequer George Osborne on Sunday said he'd extend the Help-to-Buy scheme until 2020. The scheme has been a major catalyst in housing construction, and the chancellor estimated the extension would help finance the building of 120,000 new homes, according to reports.

Shares of Taylor Wimpey PLC gained 3.5%, Crest Nicholson Holdings PLC added 3.7%, and Barratt Developments PLC picked up 3.1%.

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