As I understand it, their average audience per-minute across the day just before they started their PGA Tour contract was 44,000 homes. That was incuding infomercials, tournament coverage, the works. That's out of the 80 million homes the channel reaches in the U.S.
Including Tour coverage, the average audience is higher. How much,it's hard to say, because GC combines their Tour telecast ratings (live and replay), and thus breaking them out to match the rest of the day takes both a slide rule and access to more info than they release. But the numbers can't be sterling.