But what if you have a metal roof.
Installing antenna on metal roof.
So you may want to put the mount on the ridge capping at the top of the roof.
In order to take advantage of a metal roof as a ground plane you cannot elevate a quarter wave vertical high above a metal roof.
You can also buy non penetrating mounts that use weights rather than screws to hold them in place.
In order to mount an antenna on your roof without damaging it you should attach the antenna to the gable the fascia or the chimney.
Be sure that the antenna can see over the roof.
Whatever you do do not put holes in your roof to attach your antenna.
Thankfully there are special indoor antennae which will circumvent this problem and help you watch tv despite having metal roofs.
Thus buildings with a metal roof or many metal components will face difficulty watching tv.
The key is that the antenna feed point which is usually at the mounting bracket should be the same physical level as the metal roof to offer the best ground plane effect.
I always recommend mounting tv antennas as high as possible.