Removing headlining for antenna access?

[JanJoh]

06, Meg II

I seem to suffer from the poor recepiton that seem to be pretty common.
I just wonder if someone would have any points as to "How" and "how much" of the headlining i need to remove to access the antenna?

I did a quick forum search and found some nice pics of a dismantled meg, but no real clue as how to do it in an orderly and non-destructive fashion?

[JanJoh]

Ok, i should have elaborated I guess.

The two rear clips on the rear edge are simple, but I cannot really figure out how to handle the sides.

[Dannyh]

What are the solutions to poor signal? My signal is bad at the best of time but when I plug my dash cam into cigarette lighter it kicks everything out apart from the local station in my town. Need a solution