omni or directional?
I hope there are some antenna geeks watching. I need to hook up an outdoor TV antenna. All of the towers I am interested in are within an 40 degree arc. Can I use a directional antenna or do I have to use an omni? The manufacturers don't seem to cover that kind of information.
A second question I have is about metal roofing. There may be a metal roof in my future. How will this affect the performance of a roof-top antenna?