Last month saw commercial radio post its ninth consecutive month of growth in metropolitan advertising revenue.
Total advertising spend climbed slightly to just over $62 million, up half a per cent on the previous year, according to Deloitte's 2013 Metropolitan Commercial Radio Advertising Revenue.
Sydney was the strongest performing market, growing 3.15% to $19.3 million. Melbourne climbed a single perecentage point to $19 million, while Perth rose half a per cent to $8.5 million.
Meanwhile, Brisbane was up slightly to almost $10 million, and Adelaide was down just over 8% to $5.5 million.
Chief executive officer of Commercial Radio Australia, Joan Warner, said: "Nine months of continuous growth shows that radio remains a reliable and valuable medium for advertisers in challenging market conditions."
All metropolitan markets posted gains for the first four months of FY14. Melbourne led the way, up 6.75% to $73.5 million. Perth was up just over 5% to $32.5 million, Sydney spiked 3.65% to $74.1 million, while Brisbane grew by 1.85% to $36.6 million.