You can also buy non penetrating mounts that use weights rather than screws to hold them in place.
Install antenna tripod on roof.
When the tripod is level firmly press the centered leg platform with the sealing pad to the roof directly over a roof rafter.
Inserting a short pipe will provide a reference for level and make the tripod easier to handle.
Insert two 14g 90mm or 100mm hex head roofing screws into the holes.
You can then secure the tripod to the blocks using lag screws or machine bolts through w washers nuts.
Using some components left over from a former satellite install made converting to an off air antenna rather easy.
Using a drill with a medium torque setting selected drive the screws back in.
If you feel you need a stronger mounting you can drill holes through the roof locate them on the underside of the roof and install 2x blocks between the roof joists under the drilled holes.
Whatever you do do not put holes in your roof to attach your antenna.
Insert a mast pipe into the tripod and tighten pipe support bolts.
Unfold the tripod legs and loosen pipe support bolts.
You are now ready to hook the antenna to the mast using the u bolts provided with the antenna.
Squirt silicon down the hole and around surface replace the tile roof tripod base on the tile and align the screw holes.
Tighten the screws until the mast is secure.
How mount an antenna on your 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.
Place the tripod on the roof peak.
Squirt more silicon over the tops of the screws and smooth with your finger.
Pitch pad seals should be installed under the tripod legs.
Be sure not to deform the corrugations of the roof by driving too far.
Apply silicon to roofing screw holes replace the tripod base and put the roof screws back in place by hand.