I just ran WiFi Analyzer, though I'm not quite sure I understand it, but looks like our 5Ghz was fine for channel, tho it suggested there might be better channels for the 2.4Ghz band.
I looked to see what networks the Pixel C picked up, mostly the same as what my Nexus 7 (2013) did, with maybe one exception. Sitting here in the living room, I'm about 15-16 feet from the router, full bars. Went down to the basement, stayed connected at 3 bars, even out in the garage, which was about as far from the router as I could get without going outside. So here at home, connection looks good so far.