LONDON, Feb 17 - Sterling extended its gains versus the dollar to above $1.90 on Tuesday, as high-yielding currencies enjoyed broad support against the greenback. Analysts said the British pound was also helped by reports that Britain's Vodafone lost a costly battle to acquire U.S. company AT&T Wireless . Markets had feared pound outflows into dollars if the more than $30 billion takeover took place. "The move above $1.90 should open the way for further gains in cable (sterling/dollar)," said Ian Stannard, foreign exchange strategist at BNP Paribas in London. By 0905 GMT sterling had risen as high as $1.9004 , its highest level since September 1992. It was at 67.64 pence per euro , slightly down on the day.||