A word about video resolution, in ATSC 1.0, you want to record most sports in 1080, however the broadcasters determine what resolution they send out. If you record things in 1080 when the broadcaster is sending in 720 resolution, you'll never see the difference, and you'll be wasting space on your hard drive.
Here is the general guide for the major networks.
ABC, FOX, CW, is 720p @ 60 FPS
CBS, NBC, PBS is 1080i @ 30 FPS
Unless your going to upscale the files afterwords...