NETGEAR Universal Wi-Fi Range Extender: Broaden your network connection with a range extender that gives you extra Wi-Fi coverage in your home. Smart LED indicators will direct you to the optimal location to plug the extender into the wall, so you can easily enjoy improved range and speed on your mobile and wired devices. Save on data usage by connecting your smartphone or tablet to your home network.
I recently had my modem relocated from the ground floor to the basement. This resulted in wi-fi being available in just half the house, nothing in the LR, K, DR. This wi-fi extender, a very reasonable solution, was recommended by the sales person. If it didn't work he suggested the next step would be to consider buying a better modem than what the cable co provides.
I installed the wi-fi extender in a central location where there was a good strong signal, simply right into a power strip (no other option at this time), and it works like a charm! Now I have "Wi-Fi All Over" the house again.