Standard head unit removal help please

I wanted to change my head unit, done the usual pull it out using the pins, unclipped the big black plastic bits and then I couldn't seen to disconnect the aerial part, it was held on with a white plastic cube part and I didn't know how to disconnect it, any ideas as I'm guessing it's something simple?
 
I found that there was a small plastic tongue clip, similar to other plugs. which I ended up snapping off when I tried prizing it.
 
I found that there was a small plastic tongue clip, similar to other plugs. which I ended up snapping off when I tried prizing it.

Did you manage to unattached the aerial in the end or not? Does the white square plastic bit come off too or just the metal peice of the aerial, I was scared to separate them incase I broke something [MENTION=52417]krash67[/MENTION]