But it also means that there can be problems in the areas covered by both the router and the extender where their signals overlap. Using the same log-in credentials allows you to roam between the router and extender without re-logging in and connect with networked printers and storage drives. When setting up the extender you’ll have to decide whether to keep the same network name and encryption passcode or use a different one. The prime culprits here are microwave ovens, cordless phones, refrigerators or even baby monitors.

Another big disruptor of Wi-Fi extenders are stray radio-frequency signals from things that interfere with the Wi-Fi signals. When picking your extender’s location, avoid objects that will either reflect the signal (like mirrors or large pieces of metal) or absorb it (walls, closets or masonry supports). In fact, it often works best in multi-story situations if the router and extender are roughly above or below each other. Solve this by moving the extender closer to the router than you might if both devices were on the same floor. However, when setting up an extender for a floor above or below the router (such as for a basement or attic), you’ll need to take account of the extra height and all the wood, steel and plaster in your floors and ceilings - building materials that can absorb part of the Wi-Fi signal. If you have a ranch house or a single-floor apartment, you should be home-free.

Upstairs, downstairs: Better signal in multistory homes

Netgear's Nighthawk EX7000 is among our top choices for Wi-Fi extenders.

Wifi extender