wifi in rpi 3 verry bad !! in the other room there have poor signal - constant interruptions. LG TV in other room (over wifi) play 4k video with 46Mbit bitrate good. Wifi module hangs and does not reconnect. It would be better to buy orange pi.
How to return the money for this wonderful device ??
p.s. All smartphones have built-in wif antenna and working good, but rpi 3 wifi - developers error. And not usable for all!