The Best Wi-Fi Extenders

A Wi-Fi extender is a band-aid, not a cure. But if your dead spot is one room and you do not want to rewire your house with a mesh system, we tested 8 extenders and found two that extend coverage without halving your speed -- the fundamental flaw that has plagued this product category for years.

The core problem with traditional Wi-Fi extenders is physics. An extender receives a signal on one radio and retransmits it on the same radio, which means it can only listen or talk at any given moment -- not both simultaneously. This halves throughput by design. Wi-Fi 6 extenders partially solve this with better spatial multiplexing and OFDMA scheduling, and tri-band extenders solve it entirely by dedicating one band to the backhaul connection. Our testing focused on real-world throughput after the extender's overhead, not the theoretical speeds printed on the box.

We tested 8 extenders ranging from $30 to $150 in a 2,200-square-foot colonial home with plaster walls (a notoriously difficult environment for Wi-Fi). The dead spot -- a back bedroom that averaged 12 Mbps on the router alone -- served as our primary test location. We also measured at two intermediate positions to evaluate how each extender handled the transition zone between router and extended coverage.

How we tested

We measured throughput before and after each extender using iPerf3 running on a wired server, testing at the dead spot (35 feet through two plaster walls) and at two additional positions: 20 feet (one wall) and 15 feet (line of sight). Each position was tested five times with a 60-second iPerf3 run, and we report the average. The baseline router was an ASUS RT-AX86U running the latest firmware, connected to a 500 Mbps cable internet connection.

Latency was measured using continuous ping to the gateway during a sustained throughput test, simulating real-world conditions where you are streaming video while someone else browses. We recorded average latency, 95th percentile latency, and jitter -- all critical for video calls and gaming. We also tested seamless roaming by walking a laptop running a continuous video call from the router's coverage zone into the extender's zone, noting whether the call dropped, stuttered, or transitioned cleanly.

Extender vs. mesh: when each makes sense

Before spending money on an extender, ask yourself how many dead spots you have. If the answer is one -- a single room or a patio -- an extender is the right tool. It costs $30-$130, plugs into an outlet, and takes five minutes to set up. A mesh system (three units for $200-$700) is overkill for a single dead spot.

If you have two or more dead spots, or if your entire home has inconsistent coverage, buy a mesh system instead. Mesh nodes communicate with each other over dedicated backhaul channels, creating a genuine unified network. Extenders create a separate network (or at best a loosely coordinated one) that your devices often struggle to transition between. We cover mesh systems in our Best Wi-Fi Routers review.

One exception: if your router already supports TP-Link OneMesh or a similar proprietary mesh protocol, buying a compatible extender effectively gives you mesh performance at extender prices. The RE715X paired with a TP-Link OneMesh router delivered roaming performance within 8% of a dedicated TP-Link Deco mesh system in our testing.

Runner-up picks

Throughput results

The numbers tell the story. All measurements are averages of five iPerf3 runs at each position, in Mbps:

The gap between Wi-Fi 6 extenders and the Wi-Fi 5 EX3700 is dramatic. Even the cheapest Wi-Fi 6 option (RE605X at $55) delivered 2.5 times the dead-spot throughput of the EX3700. If you are buying an extender today, there is no reason to buy Wi-Fi 5 unless budget is the only consideration.

Placement tips

Where you plug in an extender matters more than which extender you buy. The optimal position is halfway between your router and the dead spot, in a location where the extender still receives a strong signal from the router. Every extender we tested included a signal strength indicator -- use it during setup and do not settle for a "weak" reading at your chosen outlet.

Common mistakes we observed during testing: placing the extender inside the dead spot (it cannot extend a signal it cannot receive), placing it behind furniture (attenuates the signal by 3-6 dB), and placing it on a power strip with other electronics (introduces interference). An open outlet on a hallway wall, at chest height, produced the best results consistently across all eight extenders.

Latency and gaming considerations

Every extender adds latency. In our testing, the best (Netgear EAX5400) added 15ms and the worst (Netgear EX3700) added 34ms. For web browsing and streaming, this is imperceptible. For competitive online gaming, it is noticeable. If gaming is your primary use case for the dead-spot room, prioritize wired connectivity -- the RE715X's Gigabit Ethernet port paired with a 50-foot flat Ethernet cable ($12) will deliver lower latency than any wireless extender.

For casual gaming, the Wi-Fi 6 extenders are adequate. The 18ms added by the RE715X is within the range that most players cannot perceive, and the jitter (variation in latency) was only 3ms -- smooth enough for online shooters and MOBAs.

Gold Tested Score: Speed retention: 9.3/10, Range extension: 9.4/10, Latency: 9.1/10, Setup: 9.5/10, Roaming: 8.9/10. Overall: 9.2 (/ 10)

The bottom line

The TP-Link RE715X scored 9.2 against a category average of 6.5, delivering 285 Mbps at our dead spot for $70. It is the rare extender that does not feel like a compromise. OneMesh compatibility gives it mesh-like roaming with TP-Link routers, the Gigabit Ethernet port provides a wired fallback for latency-sensitive devices, and setup takes under five minutes. The Netgear EAX5400 is faster but costs nearly twice as much. The TP-Link RE605X saves $15 but sacrifices 50 Mbps at the dead spot. For most homes with a single dead spot, the RE715X hits the sweet spot of price, performance, and simplicity.

Extender vs. mesh: understanding the technology difference

Wi-Fi extenders (repeaters) receive the existing Wi-Fi signal, amplify it, and rebroadcast it. The fundamental limitation: the extender communicates with the router on the same channel and frequency it uses to communicate with your devices. This creates a "half-duplex" bottleneck — the extender alternates between receiving data from the router and sending it to your device, effectively halving the available bandwidth. A 300 Mbps Wi-Fi signal extended through a repeater delivers approximately 150 Mbps at best. This bandwidth reduction is acceptable for web browsing and email (which require minimal bandwidth) but noticeable for video streaming, video calls, and large file transfers.

Mesh Wi-Fi systems (Eero, Google Nest Wifi, TP-Link Deco, Netgear Orbi) use multiple access points that communicate with each other on a dedicated backhaul channel (a separate radio band reserved for inter-node communication). Because the backhaul channel is separate from the client-serving channels, mesh nodes do not suffer the bandwidth-halving limitation of repeaters. A mesh node delivers near-full bandwidth from the parent router's connection. The trade-off: mesh systems cost $150 to $400 for a 2-to-3-node system versus $30 to $80 for a single Wi-Fi extender.

When an extender is sufficient: Small homes (under 1,500 square feet) where the Wi-Fi signal needs to reach one or two additional rooms. Internet plans of 100 Mbps or less (the bandwidth halving of an extender still delivers 50+ Mbps, which is adequate for most tasks). Use cases that are not bandwidth-sensitive (smart home devices, casual browsing, email).

When mesh is worth the investment: Larger homes (1,500+ square feet or multi-story). Internet plans above 200 Mbps (where bandwidth halving produces noticeable performance reduction). Households with 10+ connected devices competing for bandwidth. Video streaming in 4K, gaming, and work-from-home video calls in rooms distant from the router.

Optimal Placement Strategy for Maximum Coverage

Placement is the single biggest factor in extender performance — more impactful than the extender model itself. The most common mistake is placing the extender in the dead zone where signal is weakest. This seems intuitive but produces poor results: the extender receives a weak signal from the router and amplifies that weak signal, delivering only marginal improvement. Instead, place the extender at the midpoint between the router and the dead zone — where the signal from the router is still strong (at least 50 percent strength). The extender then rebroadcasts a strong copy of that signal into the dead zone.

Vertical positioning affects coverage more than horizontal positioning. Wi-Fi signals radiate outward in a roughly donut-shaped pattern from the antenna — strongest horizontally and weakest directly above and below. For multi-story homes, placing the extender on the floor between levels (upstairs floor or downstairs ceiling area) provides better vertical coverage than placing it at desk height. In our testing, an extender mounted on the wall at outlet height on the second floor delivered 40 percent stronger signal to the first-floor room below compared to the same extender plugged into a desk-height outlet on the first floor.

Interference sources matter. Microwave ovens, cordless phones, baby monitors, and Bluetooth devices all operate on or near the 2.4 GHz band. Placing an extender within six feet of any of these devices creates intermittent signal degradation that is difficult to diagnose because it only occurs when the interfering device is active. The RE715X mitigates this by preferring the 5 GHz band for client connections, but 2.4 GHz fallback is still used for devices that do not support 5 GHz — most smart home sensors, older laptops, and some IoT devices.

Dense building materials — concrete, brick, metal studs, and foil-backed insulation — attenuate Wi-Fi signals significantly more than drywall and wood framing. A single concrete wall can reduce signal strength by 50 to 70 percent. In homes with concrete interior walls, placing the extender on the same side of the wall as the dead zone (with line of sight to a doorway or opening that faces the router) consistently outperformed placement on the router's side of the wall. Our testing showed a 65 Mbps throughput difference between these two placement strategies in a home with poured-concrete interior walls.

Firmware updates and long-term security

Keep your extender's firmware current -- it is the most overlooked maintenance step. Firmware updates patch security vulnerabilities that attackers actively exploit to hijack home network traffic. In our post-test audit, three of the eight extenders shipped with firmware containing known CVEs that had already been patched by the manufacturer. The RE715X supports automatic firmware updates through the Tether app, which we recommend enabling immediately after setup. Check for updates at least quarterly if your model lacks auto-update capability. An extender running outdated firmware is not just slower -- it is a potential entry point into every device on your network, from laptops to smart home cameras.