Cut 1/2 inch PVC piping four inches longer than each side of your banner. If you banner is 3 feet wide by 6 feet high, you will end up with two lengths that are 3 feet 4 inches in length and two lengths that are 6 feet 4 inches in length.
Cut one more length of PVC piping to be 8 feet long.
Cut the top cross section of the PVC pipe into two equal sections, then reconnect the two pieces using a PVC "T" connector.
Assemble the frame by connecting each of the PVC piping pieces using a PVC "L" or "elbow" joint.
Attach the banner to the PVC frame by tying string through the circular grommet openings in the corners and side of the banner and tying the string to the frame. You can also use twist ties or the locking plastic connectors to achieve the same result.
Stand the banner up, insert the 8 foot length of PVC piping into the "T" connector in the frame's top crossbar to support the banner and frame.
Use camping pegs to secure the banner to the ground.