The antennas have a direction, and you aim them with a compass in the direction of the station(s) you want. Position the antenna so that it does not point through a tree. Just like aiming a gun - pick the location where you don't aim through the tree. Then pick the location where any trees or buildings in the distance are furthest away. You want clear air to the horizon in the direction of aim, if you can manage it.
Yu can go here -
http://www.antennapartsoutlet.com/ - and browse through the various ways of mounting antennas. Telescoping masts, tripods, eave brackets, wall brackets, chimney brackets, etc. Let your building configuration and orientation dictate which type of mount you use.
If you are interested in the Y10713, I suggest you buy from Radio Shack. The Antennacraft site has a button direct to there -
http://www.antennacraft.net/Antennas/AntennasVHF.html They also have their data sheet, which you should read.
I bought my Y10713 from Radio Shack, and my DB8e through Amazon. The DB8e data sheet is on the Antennas Direct site -
https://www.antennasdirect.com/store...V-Antenna.html