Determine the location for the trellis. Set the grape plants on one side of the trellis. Make an 8 foot by 8 foot square. At each corner place one pipe into the ground. They should go into the ground at least 1- 1 1/2 feet deep.
Add the gate ells to the tops of each pipe.
Add an aluminum eye top to a separate 8 foot pipe. Place the end into the open end of the gate ell and secure. Place another eye top in the opposite end and place this into another gate ell. Repeat this on the other two bars. At this point you should have three bars secured together with two eye tops attached to the top bar.
Connect one bar to the eye tops on the front and one for the back. Use duct tape to secure this for now. At this point all the bars are connected.
Add the galvanized wire to the side where the grape plants have been planted. Make horizontal and vertical lines weaving the wires at the intersections for strength. Space the lines about 1 foot apart. Add the lines on the top in the same fashion. Use all four poles to secure the wire.