Get decent WiFi the other side of walls,
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This review is from: TP-LINK TL-ANT24EC5S 5m Antenna Extension Cable (Personal Computers)
WiFi has been run though to our kitchen which has always been a bit of a WiFi black-hole. Just take off one of the antennas from the router, plug the cable in its place and attach the router's antenna to the other end - Bingo - decent WiFi in the kitchen.
OK, then there is the job of doing it properly by drilling holes through walls and tidying this cable away in duct.
If you are going to do this make sure you get a long enough cable as by the time you've tidied the cable it will probably be quite a zigzag route. 5 metres is a good length unless you are just going through one wall - in that case the 3 metre cable could be enough