Network OTA broadcast are usually better quality than Cable/Satellite because Comcast and others compress the channels to hell to allow more channels.
Also if you are interested in an OTA DVR, I'd suggest looking into Tablo. I got one this past weekend and have been really impressed with it's abilities. It's like a TiVo and sling box in one with an interface that blows away what Comcast offers. There are also applications on their forum made by users that allow you to rip your recordings to MP4. It's $200, but I cut the cord a few years ago so I can easily justify the upfront expense for the free OTA programming.
I really like Tablo in principle. I have contemplated buying one, and would gladly buy the lifetime subscription. My only holdup is the lack of AppleTV support (other than AirPlay). If Apple releases a new AppleTV with a proper app store or updates existing ATV3s to include an app store, and Tablo makes an app, I would jump on it in immediately.