If you don't mind me asking, where do you live. I've thought about doing this, but I live in Iowa City, and am not sure how strong the signals are out of Cedar Rapids & Waterloo for ABC/NBC/CBS. According to the FCC, the signal is "Moderate" for most of those. Not sure how good "Moderate" is. The Digital TV Transition: Reception Maps That's also assuming an outdoor antenna 30 feet off the ground, which I don't, and won't, have.
OTA digital signals are a little bit different than old analog stuff. From what I've found you either get it or you don't there's not much in between. Static is a thing of the past, but I am by no means an expert, just my experience.