Abstract: A gate assembly is formed from a gate attached by hinges to a jamb. A pair of L-shaped brackets are attached to the outer sides of the jamb. The brackets are in turn attached to a pair of gate posts in a barrier. Bolt holes formed in the header section of the jamb receive removable eye bolts that may be used as hoisting points as the jamb is being positioned within a barrier. To maintain the shape of the jamb during such positioning, a removable sill section is included in the base of the jamb. The first upright section of the jamb defines an unobstructed internal channel bounded by input and output portals. A cable may pass though the channel and into the gate by way of the output portal. Window openings in the gate may be fitted with removable window panels containing pickets and infill material. Dual gates may be positioned within an enlarged jamb, and a removable mullion post positioned between the gates and supported by the jamb.