A metal roof discourages the transfer of signal by reflecting it away from you.
Installing antenna on metal roof.
Thus buildings with a metal roof or many metal components will face difficulty watching tv.
So you may want to put the mount on the ridge capping at the top of the roof.
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.
But what if you have a metal roof.
They can also be put lower on the rows of screws that hold the metal sheeting to the roof batons.
I always recommend mounting tv antennas as high as possible.
You can also buy non penetrating mounts that use weights rather than screws to hold them in place.
Tin roof mount where to place the mount.
Thankfully there are special indoor antennae which will circumvent this problem and help you watch tv despite having metal roofs.