Nipped to a local metal fabricators this morning and scrounged an offcut, Cut it to the desired length and set about making a couple of bends in it thanks to the help of the bench vice.
Once an ok shape was made i drilled a couple of holes in each end..One to fasten to the threaded hole in the top of the spare wheel hanger and one to bolt the aerial mount to on the other end.
Heres some pics of the half finished item..
It doesn't look too bad mounted on the vit..
I have taken the sharp edges off with a file and de-greased the steel a little ready for painting.
Its now hung in the shed with a couple of coats of hammerite smooth black on it. When its finished i will stick a couple of pics up. The mount i used was just unscrewed from the magmount i had in the shed, I haven't tested it at all yet but it should work in theory.