You should be able to purchase one at Walmart where it would have instructions in the book. Follow the directions, you should go to the hightest point on your roof.
Outdoor television antennas usually come with installation brackets to attach to a roof. If yours doesn't, you need to make sure that it is firmly attached to the roof so that it doesn't fall off during a windstorm.
Contact a technician who is skilled in installing antennas to teach you how to link the cables, and digging the hole to insert the pole that holds the antenna.
An outdoor TV antenna is installed at the highest point you can reach, usually strapped to the chimney of your house. A wire is run from the antenna to the TV.
You need to run the antenna line from the TV to the outside of your house. The best place in the roof. There are antenna kits that give you all the pieces to attach it to the house.
