As with any project, careful planning will make the job much easier. Before you purchase a system, determine how much area you'll want to cover. Most basic systems include a transmitter with the potential to enclose an area of about 25 acres. Higher powered transmitters are also available to enclose even larger areas.
Additional wire is necessary for such big jobs, however.
Using graph paper, plot your yard and draw in the area you want to cover. In most cases, corners must be rounded because right angles confuse the transmitter. The wire forming the fence boundary must make a continuous loop back to the transmitter, an important thing to keep in mind as you map out your fenced area. Your transmitter must be located indoors in a dry, protected area. A garage is a good choice.