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A lot of networks require you have a cable or satellite provider to watch any of their content. There are other options that don't require subscriptions. I can stream network shows a couple hours after they air and also stream Tv stations from across the globe.http://www.theinternetpatrol.com/how-to-capture-and-record-streaming-video-on-your-mac/
Almost all of the networks stream their content 24h after the original air date.