Here’s everything you need to know about these handy devices, along with our selection of the best Wi-Fi extenders on the market. You might have a fast broadband connection, but does it reach everywhere you need it? Are you finding that you can’t stream TV or have a video chat in the more distant corners of your house? If so, a Wi-Fi extender might be the answer, stretching your Wi-Fi network out so that you get better speeds and coverage exactly where you need them.