I made this 6 meter portable dipole using collapsible antennas and PVC. To center the hex coupler nut and to keep the epoxy cement contained I used a rubber grommet around the coupler nut. A length of 51 to 52 inches per side will enable a usable SWR over the entire 6 meter band. List of parts needed is at 13:28 of video.
This video slideshow shows how I built my portable 6 meter dipole antenna. The mast is 1 1/4 inch PVC. The elements are 1/2 inch aluminum tubing with 3/8 inch tube that slides inside the 1/2 inch. I used a MFJ-269 SWR analyzer to check the antenna