Rogue Amoeba is one of the best Mac software developers and their audio apps are by far the best I've seen.
I used an older version of Audio Hijack years ago to record the AM radio for a few weeks in Minnesota winter—I put clips of the morning host announcing school closures into a playlist for a show we did at the gallery I ran. We called it Snow Day and it was a hit in the middle of July.
Also checkout Nicest for live streaming podcasts.
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