How WiFi extenders work (and why they're limited)
WiFi extenders repeat the signal from your main router. In theory, they double coverage. In practice, they cut bandwidth in half — your extender receives and transmits on the same channel simultaneously. Result: Extender gives you 50% of original router speed in the extended area. Better than no signal, but noticeably slower.
How mesh systems work (and why they're better)
Mesh nodes communicate with each other via dedicated backhaul (separate channel from user devices). Each node is a full router, not a repeater. Result: No bandwidth loss when roaming between nodes. Seamless handoff — devices automatically connect to the closest node. Trade-off: Mesh costs 3–5× more than extenders.
When an extender is enough
Home is under 2,000 sq ft, one dead zone (garage, bedroom far from router), budget under $50. Extender covers that one area at acceptable speeds (50+ Mbps). Use case: WiFi in garage for smart lock, or bedroom for streaming. Not ideal, but workable.
When you need mesh
Home is 2,500+ sq ft, multiple floors, thick walls, or dead zones in multiple rooms. Budget $200+. You need consistent speed everywhere, not just coverage. Use case: Gaming in any room, video calls in bedroom, 4K streaming in living room. All require sustained speed, not just signal bars.
Best extender: TP-Link RE605X ($40–50)
WiFi 6 extender, covers 1,500+ sq ft, app setup. Best in its class if you absolutely need an extender.
Best mesh: TP-Link Deco XE75 ($200–250)
WiFi 6, 3-node covers 3,000+ sq ft, seamless roaming. Better long-term investment than extender.