He got checked head first in the boards . <| sep |> In the quick newbie guide , he mentions that his channels are all 5 in the magn catergory and that ' s generally ok . Mine are not . What does that mean ? High performance antennas are by necessity very directional . So they work best when all the signals are from the same direction . The sort of antennas that you can use for indoors are very low performance and tend to be bidirectional . So if you are doing indoors then you shouldn ' t worry too much about this . I will point out though , that if you were to point a higher performance antenna a bit west of due north that you would get a complete set of popular networks from that direction . Something to keep in mind if you end up having to go for a roof antenna or attic .