The Sensex is likely to open on a rather flat note and may trade in a narrow range with a positive bias for most of the trading day today. World markets are awaiting for Fed' move tomorrow.Technically the Sensex is poised to make a major decisive break this week. A either side breakout of last week's high and low (11,082 & 10645) could set the trend for the rest of the month.On the upside, the index is likely to face resistance around 10,955-10,980-11,010 levels. On the downside, the index has support around 10,780-10,750-10,725 levels.