The interest rate Entercom pays will not change. The current credit agreement is dated June, 2007, not that long ago. The amendment, which did not require the company to pay greatly increased interest rates and required the payment of a few of less than one per cent of the size of the debt, is dated only six months ago. The lenders had the chance to extract blood in March, but they didn't.
Expect, worst case, the operating results you have seen over the last 12 months to continue.