The Catholic Channel is on Sirius Satellite Radio, channel 159. Even if you don’t have a satellite radio, you can still subscribe to the channel and listen via the Internet. Several members of the First Things crew have been on the program already, talking about everything from current articles in the magazine to extracurricular projects to Martin Luther King Jr. to movies.
In the interest of ecumenical goodwill, also tune in regularly to KFUO—Lutheran Worldwide Radio. As far as I know, Sylvester Stallone will not be appearing on any of its programs, but at least the Lutherans are free.