Iphone 6 has trouble connecting to home Wi-Fi, but other devices connect to it flawlessly?

I noticed recently that I can't pick up a Wi-Fi signal from my router unless I'm standing beside it or in a close room. I have checked with other devices and this is not the case -- the Wi-Fi connects flawlessly and it is as fast as it always has been. It's just my phone! I have the latest iOS installed and have cleared networking data many times, but it still continues to not work. Any help is appreciated.

Added (1). I can connect to public Wi-Fi and other homes' networks, just not mine.

Bad antenna, bad router, bad phone. Contact Apple.