Not all local advertisers buy radio, but those that do are showing their confidence in the medium with their dollars. The average local radio station advertiser spent $48,060 in the medium last year, which according to a new report from Borrell Associates puts AM/FM near the top when it comes to spending. The only media channels to get a higher average spend from local advertisers last week were out-of-home (67,575) and search engine marketing (58,567) with radio getting a higher average total t