Antenna damage?

Well, i just upgraded my mac mini to a larger hard disc, which went, generally, without a hitch.

Only problem is i'm worried i might have caused the antenna for the wireless network some damage during the disassembly process, sometimes it can find a network, but it can't connect. Beforehand the network was working perfectly well..

I can attempt to disassemble again, but i need to know what to look for. a lot of the instructions online were a little sketchy.

Thanks for any possible help