The company said advertising market visibility continued to be low, although it was seeing early signs of a recovery in the UK and the Netherlands, while the German market remained weak and France flat.
The broadcaster said the performance in the UK would help it to meet market expectations for the full year.
RTL CEO Didier Bellens said Channel 5 grew its audience share by 10% and that its advertising share was up 14% since the beginning of the year. RTL owns 65% of the UK terrestrial TV channel.
Channel 5's advertising share increased to 7.3% at a time when the wider TV market is down by 1% year on year, while its audience share is up 10% year on year to 6.4%
Bellens added that RTL's TV production business FremantleMedia, formerly Pearson Television, has also performed well.
"FremantleMedia has continued to improve, helped by the success of 'Pop Idol' in both the UK and the US as well. Despite difficult trading conditions over the half-year, we continue to perform well and attract significant audience share in our main markets," he said.
In the coming year, Bellens said that RTL was focusing on reducing costs and selling or closing down non-core underperforming assets.
"Because of these measures to improve operating efficiency, RTL Group will be well positioned to benefit when the rebound in the advertising market comes."
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