wifi problem clone galaxy s3 6575

i have week wifi problem after search in Xda forms i found that some users have same problem they fix by aluminum foil but i dont know where they tape if some one can help me. check this

if have rom for following cp
with no problem
chip :MT6575
MS board : GT-I9300
kernel : 3.0.13 () (gcc version 4.4.3) sat aug 4
android version 4.0.4

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