National revenues climbed 3.4% to £85m and local revenues climbed 1.2% to £40.4m.
However, sponsorship and promotions revenues fell 8% to £24m.
Overall, the figures reinforce expectations commercial radio is close to a recovery, after a weak couple of years in which advertisers diverted their spend to other media.
Simon Redican, managing director of the Radio Advertising Bureau, said: "The results are extremely encouraging. We have already stated our optimism publicly but it is always good to get confirmation."