Al (VK1RX) put me onto this antenna designed by VK3DIP (Paul). The link to his page is here
I built mine out of 10mm aluminum tube from Bunnings and I had a 3m length of 25 x 25mm rhs which I used for the boom.
I will post images of the element mounts at a later stage. Below are the SWR results. I am pretty happy with them.