Crestview Capital has increased its stake to more than 48% of Cumulus Media Inc.’s common stock (yesterday’s TRI), and now Seeking Alpha says Oaktree Capital’s Howard Marks has bought nearly four million shares of Cumulus in the third quarter, at an average price of $2.99 a share. So far, his investment is down a bit, with Cumulus closing unchanged yesterday at $2.92. But look at the bigger picture – Oaktree’s been a consistent believer in radio (particularly radio + digital) since it backed GAP Broadcasting, then acquired Regent and put all those properties into Townsquare Media. On the service/vendor side, Oaktree is the parent of of Dial Global, which recently acquired and merged with Westwood One, to become public. It also owns vendor/service provider Triton Digital. So look at Oaktree’s nearly $12 million recent investment in Cumulus, and you see a company that continues to bet on radio. (Separately, Oaktree itself is going public under the symbol “OAK.”)