LG G2 Wireless problem

Hello. I've been having problems with my phone after replacing broken screen. The phone works fine, I have signal and everything works fine, but I have a problem with wireless. I can use wireless,but the range is absolutly terrible. If I am located more than 5m from my router the wireless signal cuts and if I'm located right next to it, I'll have about 4 out of 5 bars. So I suspect the problem is with wireless antenna, but where it is located and what should I do to fix this problem?

Thanks

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