This roof mount will support a satellite dish up to 90cm in diameter.  It is easily mounted to most tin roofs.  The base plate is designed to sit across two currugations on the roof and screws down to the roof using the existing tek screw holes.  Therfore, no additional holes in your roof should be necessary.  The stay arms also screw down through the roof into the battens.  The upright pole can be adjusted plumb in both directions prior to locking them down with a self tapping grub screw.  Will suit any pitch roof.