Fixed
How'ya
Right, changed it. I shall include pics etc below of the nuts/screws etc that I removed. Unfortunately, as I got carried away fixing it, I didn't get pics of actually putting in the aerial (hands were busy

. (Right-hand Irish model).
Excuse the quality of the pics, they are quite small, but you'll get the idea.
The original top nut of the broken aerial just kept turning, hence having to remove the wing.
I have taken some advice from the people above (many thanks guys) and also worked somethings out myself. I am not a mechanic, and am only beginning DIY mechanics so chances are I may have done something incorrectly or missed some important steps (but I don't think I did).
a) Open bonnet, and remove the 6/7 screws tying the wing to the engine body (see line-of-screws-bonnet.jpg (tilt your head to the left)).
b) Remove front indicator light and headlight. There is a small screw tying the wing into the bit of jeep under headlight. I removed it but it may not have been necessary. (see behind-right-indicator.jpg)
c) Open your drivers door, there are 4 bolts securing the wing to the body of the jeep, you'll need a socket set (more new tools

for this bit (see door-meets-wing.jpg (tilt head to the left again)).
d) Up where the windscreen meets the bonnet, over at the aerial side, there is a small screw that holds a section of black (on mine) plastic. This I am fairly sure should be removed, I attempted to 'work' the wing away underneath this and <b>broke</b> the plastic (so that's gonna need to be replaced goddamnit) (see aerial.jpg - not great quality).
e) Work the wing away from the jeep from the top, mine didn't come off completely, but I was able to move it about 5 inches back from the top of the bonnet. Once back, be careful of <b>very</b> sharp edges of the underside of the wing (and don't let important bits fall to the bottom of the wing

.
f) I was able to remove the old aerial, but I didn't fancy attempting to get the new cable all the way over the radio. The coax goes from in the wing through the engine space into toward the back of the dashboard. I connected the old coax to the new in that space using a coax connector (means I can get to it if I have any problems). Tested aerial obviously before putting it all back together.
g) Put everything back in reverse order and happily was left with no nuts/screws/bolts left over (and all tools back in boxes).
Apologies if this is all over the place but that is my experience. If anyone has any question, PM or email me. If anyone has any comments, please feel free to add them here, as I previously mentioned, I am a beginner car wise (can do everything around the house so thought it was time to turn my attention to the jeep).
Rgds,
Wicklah