Should I risk breaking my LG V20?

I bought a new-in-box LG V20 about 18 months ago because I was tired of phones without removable batteries and headphone jacks. However, it gets absolutely terrible reception for some reason (as in, no signal in the middle of Manhattan). Some guy had the same problem and he soldered a big antenna to his phone to fix it. I might try to do that but given how great I am at soldering, there's a good chance I'll break the phone. Should I do it? I don't want to have to buy a modern phone with a built-in battery but I can't just have a phone which doesn't work when I'm away from wi-fi...