The wifi antenna is a Gold-ish flat piece it has a delicate black wire running to the Wifi/Mem board. The wifi wire can be poped off the the board and put back on with no problem so don't worry if that comes off. I don't believe taking it apart will do any good what so ever. This happens to A LOT of psps that have custom FW's or downgraded infact even the normal Sony FW's have some internet bugs in them.. so it's not just your psp. I wouldn't consider it "broken" though.
...But if you do take it apart hes what you need to know.
Image of the Wifi antenna

Wifi antena circled in green, the board is circled in red.