Hi
The aerial is in the rear heated screen. It is the 2 vertical bars. You should check that the bars are not damaged. Also if you can find the electrical connections, check to see that they are good and not corroded. I would also check the rear connection on the radio.
Another solution would be to fit an external aerial. If you are in Dublin area, you could probably get away with fitting it in the glovebox , saving having to mount it on the body. Not ideal but easier.