Knotted Wire Fence also called Fixed-Knot fence or field fence is produced in a range of sizes to suit the intended application.
Heights range from 42" with 8 line (horizontal) wires to 96" with 20 line wires.
The spacing of the line wires varies depending on the application.
Fence with the tighter 3" spacing at the bottom of the fence provides "predator control." All but the smallest predators can't get in, and small animals (i.e. fawns or lambs) can't get out.
The distance between the stay (vertical) wires varies from 3" to 6" to 9" to 12".
The closer the stays the stronger the fence. Fence with a 6" stay spacing is the most common, however 3" is suited to higher pressure or higher security areas, whereas 12" can be used in low pressure areas.
The fence becomes fully "predator proof" with 3" spacing between the horizontal line wires and 3" spacing between the vertical stay wires.
You should look for a fence that suits your budget, but keep in mind changes in your future requirements. Remember you can put cattle behind a deer fence, but not deer behind a cattle fence.