The commercial radio industry has recorded an increase in metropolitan advertising revenue of 6.28% for the month of July, to a total of $647.32 million.

According to figures released today by industry body, Commercial Radio Australia and sourced by Deloitte, advertising revenue lifted in all five metropolitan markets, with the strongest growth recorded in Perth.

Western Australia's capital saw revenue reach a total of $7.06m, a rise 10.9% compared to the same period last year.

Meanwhile, Brisbane was second, growing 9.69% totalling $8.501m. Melbourne followed in third, up 7.18% to $16.715m. Sydney grew by 3.21% to $16.665m and Adelaide followed with a gain of 2.02% to $4.908m.

Chief executive of the national body, Joan Warner, said the strong result for July, which is the beginning of the new financial year, followed last year's positive but unexpected results.

"The industry continues to gather momentum in attracting advertising revenue and remains optimistic for the next twelve months.

"However, we must continue to work hard to promote the strengths of radio for advertisers with initiatives like the recent brand campaign ads, launched early this week, which highlight that commercial radio reaches over 16 million Australians in an average week."

Warner concluded that the advertisements, titled "Australia’s Listening", aimed to place emphasis on commercial radio’s extensive audience numbers, its accessibility and its cost-effectiveness.

Media Spy discussion: Radio Advertising