Well, free is a small stretch. You will need an HDTV tuner stick, but those are cheap (you can probably find one for thirty and change) and most come with a small but surprisingly effective antenna. Plug it into your USB port and you're good to go.
I recently heard a technology reporter talking about how big it would be when someone finally figured out a commercially viable way for people to watch the Super Bowl on their computers. It struck me as a perfect ddulite moment, gushing over an anticipated technology while ignoring an existing one that had all the same essential features.
This tendency to prefer next year's toy to this year's tool is one of the ddulites' costliest traits because it leaves good, useful technology under-recognized and under-utilized. Waiting for the next big thing (like hydrogen fuel-cells or geo-engineering) can cause us to put off implementing existing technologies (plug-in hybrids, ground-source heating and cooling, etc.).
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