Simple.tv is a ready-made DVR build for watching and recording free over-the-air TV. It does not include a hard disc. The idea is that you get to decide how much you want to record and store. It’s a beautiful device with an HTML5 app that allows you to watch from anywhere.
There are a few drawbacks though. There’s just one tuner in the box and you will need a $4.99/month subscription to get the good stuff.