Conversation so far:
what radio show was steven van zandt host of ?
Van Zandt has hosted Little Steven's Underground Garage, a weekly syndicated radio show that celebrates garage rock.
when did he start hosting it?
Since 2002.
was the show popular?
As of December 2006, the show is heard on over 200 US radio stations and in some international markets.
what international markets are these?
in Spain it has beamed through Rock & Gol since 2007 and later on Rock FM Radio in Finland; Radio Helsinki started beaming Little Steven's Underground Garage in August 2008.
was his show popular internationally?
CANNOTANSWER.
what did he do as an enterpreneur?
Van Zandt is also the program director for two radio channels for the Sirius Satellite Radio network.

Question: what were the radio channels?
Self-contained rewrite: what were the radio channels Steven Van Zandt directed?