I've done a bit of research and i believe the metal band is the speaker/ringer and the wire is indeed the antenna,1 of 2.
After i removed the back cover i then scraped away the glue/foam from the speaker/ringer and accidently pulled the top of the antenna from its seating.As soon as i did 1 or both of these things,hey presto my signal went up and even without needing to reconnect the top of the antenna my signal has been far better since.