[Q] Poor wifi range after replacing housing

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Hi I have a problem recently changed the housing on the phone and noticed that after this procedure WiFi coverage is very weak, even as I stand near the router that is one line max. Is it possible that the new housing? If so, what could be the reason that this has happened and whether it can be repaired and how? The phone has been tested on many roms and was even installed android on NAND flash memory and still the same. Please help
Sorry for my English but I'm not in it for a good translator and I use to say something intelligible

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