* FTSEurofirst 300 up 0.5 pct; hits three-month high
* Stock valuation at highest since mid-May
* ECB, BoE keep rates on hold; ECB comments awaited
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By Blaise Robinson
PARIS, Aug 5 (Reuters) - European stocks hit a three-month high on Thursday in a broad rally ahead of the European Central Bank's comments on the economy, but the gains were limited by a bit of disappointment on the earnings front.
Unilever <ULVR.L> tumbled 4.9 percent after its results missed forecasts and the food major warned of rising pressures from rivals and higher commodity costs.
And British bank Barclays <BARC.L> sank 3.5 percent -- shedding some of the gains made in the recent weeks -- after posting results that failed to impress investors.
At 1151 GMT the FTSEurofirst 300 <
> index of top European shares was up 0.5 percent at 1,075.97 points, while the Euro STOXX 50 < >, the euro zone's blue chip index, was up 0.6 percent at 2,842.26 points.The two benchmark indexes have gained about 12 percent and 14 percent respectively since hitting a low in early July.
Investors' appetite for risky assets such as stocks has improved in the wake of reassuring stress tests on the banking sector, news that a planned reform of the sector would be scaled down, and solid corporate results across the board.
"Stocks have been range-bound but now we're flirting with the upper end of the range thanks to the strong earnings over the past weeks," said David Thebault, head of quantitative sales trading, at Global Equities in Paris.
"What we need now to really break out of the range is a little help from the macro data. Tomorrow's (U.S.) payrolls and unemployment rate will be particularly watched."
As expected, both the Bank of England and the ECB kept interest rates unchanged on Thursday, while investors awaited the ECB's comments from President Jean-CLaude Trichet.
Trichet is expected to reaffirm that key ECB policy rates remain "appropriate", cementing economists' view that the bank will keep rates on hold well into next year.
But the main focus for investors is expected to be on Trichet's comments on the economy, to see whether the ECB sees the euro zone recovery maintaining its recent strong pace.
The market also keenly awaited Friday's U.S. non-farm payrolls figures, coming in the wake of a batch of weak U.S. data that rekindled fears of a double-dip recession and weighed on the dollar.
Around Europe, UK's FTSE 100 index <
> was up 0.3 percent, Germany's DAX index < > up 0.6 percent, and France's CAC 40 < > up 0.8 percent.The recent strong rally has lifted European stock valuations to levels not seen in nearly three months. Shares in the FTSEurofirst 300 trade at an average 13.4 times reported earnings, a level not seen since mid-May.
"Stocks in defensive sectors such as utilities, telecoms and pharma are still excessively undervalued," said Jacques Burlot, fund manager at Tocqueville Finance in Paris.
"It's not normal that these relatively safe sectors trade at half the price-to-earnings ratio of industrial stocks that are very cyclical." (Additional reporting by Florent Le Quintrec; Editing by Greg Mahlich)