Commentary: oil service ETF nears 'double-top' trigger (OIH) By Tomi Kilgore NEW YORK (CBS.MW) -- The Merrill Lynch Oil Services Holdrs (OIH) , an exchange traded fund tracking the oil service sector, was shedding $2.58, or 3.7 percent, to a $68.04, with all 18 of its components losing ground. The OIH had hit a 1-month low of $67.50 earlier in the session after Banc of America downgraded the sector to "underweight" from "overweight," and recommended investors reduce their weightings rather than ride out a correction. A close below the March 24 low of $66.56 -- the low sandwiched between the March 2 high of $75.28 and the April 27 high of $74.20 -- would confirm a minor "double-top" technical reversal pattern in the sector tracking stock's chart. Support below that level should come in at the "gap" in the charts between the Jan. 16 high of $63.88 and the Jan. 20 low of $64.70, followed by Jan. 8 low of $61.18. Resistance sits at Tuesday's low of $69.78 (the top of the "gap" between Wednesday's high of $69.18), and then at the April 27 high.