Okay, just to follow up on this. Today I fitted this aerial booster
http://bit.ly/os7JMf which has done a fantastic job and now I can listen to FM stations very well so probably no need to get a replacement aerial as well.
The problem I have now is a ticking sound when listening to AM stations. After looking around the web people mention it's the ignition and spark plugs but I don't really want to get new spark plugs to find out that's not the issue.
Anybody else have this issue? I might add this to a new post if I don't get a response as I'm now slightly going off the issue!