How can I know if the magsafe is not working ?

Hey guys how are you doing? Let me tell you my experience and I expect your comments.

I have changed my iPad 2 wifi antenna because I accidentally broke it when I changed my touch screen. So, I bought a new antenna and I have installed it already, now I can´t get a good reception of the wifi, I mean, I have to be next to the modem in order to be connected otherwise I get poor reception or nothing.

Do you have any ideas? Do I have to replace it for a new one?