Via an HD antenna before you cancel your cable or satellite subscription, investigate what’s available to you. A good HD antenna likely offers all four major networks (Fox, ABC, NBC, and CBS), along with as many as 10-15 other selections (PBS, CW, etc. ) in HD (and, soon, 4K) resolution, all for free for people in urban areas. To ensure you’ll get decent reception, you can just purchase one and take to it down, request…