Increase Wifi range and latency

I have isues with the latency of the wifi and the range. Like when I play bot match it says reconecting. I already tried a repeater but still not good. So I have to iether use a usb dongle or a usb modem or a pci wifi? What is best for both range and latency. Ethernet cable is not an option its to far from the room and uncomfortable for other people.
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