WiFi extender: how to choose a good one (without falling for marketing)

If WiFi reaches your living room fine but drops in the bedroom or the patio, the first thing you think of is buying an extender. The promise you see on Amazon is always the same: "Total coverage for your whole home". The reality: there are repeaters that barely improve anything, mesh systems that genuinely transform the experience, and cases where an extender isn't the answer because the problem is upstream — in the fibre or the operator's router.

This guide helps you choose well without falling for marketing. No affiliate links, no "top 10", no comparison tables with inflated figures. Just what actually changes the outcome.

Do you really need a WiFi extender?

Before spending anything, rule out the two most common problems that get confused with poor WiFi coverage:

1. Slow or congested fibre. If you've contracted 100 Mbps and think it's underperforming, check the speed by plugging an Ethernet cable directly into the router. If it's bad over cable too, the problem is the fibre (low contracted speed, operator congestion or an old router) — an extender won't fix it.
2. Old operator router. The free WiFi routers Movistar, Vodafone, Orange or MasMovil hand out are sometimes 5-7 years old and far inferior to current ones. Call your operator and ask for a new one — they usually swap it free if you've been with them more than 2 years.

Only if, after these two checks, WiFi coverage is still the problem (weak signal beyond a certain distance or through thick walls) can an extender help.

Repeater, mesh or powerline: which to choose for your home

There are three product families, with quite distinct use cases:

WiFi repeater (€25–60)

The simplest: a device plugged into a socket halfway between the router and the dead zone. It picks up the router's signal and rebroadcasts it. It works, but it has three problems: (1) it halves the speed (the repeater uses the same radio to receive and re-emit); (2) it creates a separate WiFi network (you have to switch networks as you move around the house); (3) if you place it badly (too far from the router) it picks up a bad signal itself. Useful if your home is small-to-medium, your budget is tight, and you only need to cover one specific area.

Mesh system (€100–400)

Several coordinated broadcast points that create a single WiFi network across the whole house. Your phone switches points automatically without dropping the connection. They almost always include a dedicated band for the backhaul between points (no speed halving like a repeater), and app-based setup. It's the best option for medium-to-large homes, duplexes, or if you have powerful devices that rely on WiFi (4K TV, several consoles, remote work with video calls).

Powerline / PLC (€60–150)

An adapter that sends the WiFi signal over the home's electrical wiring. Useful when the walls are so thick (stone, reinforced concrete) that no WiFi gets through, but you have a power socket nearby. Limitation: it depends heavily on the quality of your electrical installation — if it passes through old fuse boxes or power strips, the speed drops. Useful for specific cases (basement, attic, very old house).

The specs that matter (and the ones that don't)

Manufacturers throw in numbers that don't mean much to the user. These are the specs that really affect the outcome:

• Dual-band or tri-band. Any decent modern mesh or extender must be dual-band (2.4 GHz + 5 GHz). 2.4 GHz reaches further; 5 GHz is faster. Tri-band (2.4 + 5 + a 5 dedicated to the backhaul between mesh points) is the next level and makes a difference in large homes.
• WiFi 6 (AX) or WiFi 6E. The current standard, better at managing many connected devices (smartphones, TVs, appliances). Backwards-compatible with WiFi 5 (AC). If you're buying new in 2026, it makes no sense to pay for WiFi 5 — the price gap with WiFi 6 is now minimal.
• Gigabit Ethernet. Make sure the wired ports are Gigabit (1,000 Mbps), not Fast Ethernet (100 Mbps). If your fibre is 300 Mbps or more, a 100 Mbps port limits you.
• External vs internal antennas. They don't correlate directly with range — good mesh systems usually have internal antennas and perform better than cheap repeaters with big external antennas (pure marketing).

Brands to consider and price ranges

With no affiliation to any brand and without getting into specific model names (they change every 6 months), the brands that consistently produce good results in independent tests:

• TP-Link Deco — mesh range with good value for money (€100-300 depending on WiFi 5 vs 6 and number of points).
• Asus ZenWiFi — mesh with advanced configuration for technical users.
• Google Nest WiFi — easy-to-set-up mesh, integrates with Google Home.
• Amazon eero — simple, reliable mesh, owned by Amazon (a privacy consideration for some).
• Netgear Orbi — high end, tri-band, large homes.

For simple repeaters, TP-Link and Linksys make solid models in the €25-50 range. Below €20 (the typical generic repeater from Amazon or AliExpress) there's a high risk it's a slow single-band 2.4 GHz unit — not worth it.

How to place an extender properly (half the battle)

An expensive mesh placed badly gives a worse result than a cheap repeater placed well. Three rules:

1. The extender needs to receive a good signal from the router. If you put it where WiFi barely reaches, it will rebroadcast a bad signal. Place it halfway between the router and the problem area, not in the problem area.
2. No big metal object between router and extender. Microwaves, fridges, large mirrors and electrical panels absorb WiFi signal.
3. Up high. WiFi propagates worse downwards than sideways. If you put the extender on the floor or on a low piece of furniture, coverage improves less. Ideally at ceiling height (1.80-2 m).

When the problem is NOT the extender

If you've bought a good extender, placed it well, and the speed is still disappointing, the problem is almost always one of these three:

• The contracted fibre speed is insufficient. If you share a connection between 4 people doing video calls and streaming, 100 Mbps falls short. These days 600 Mbps - 1 Gbps is reasonable for homes with remote work and 4K streaming.
• The operator's router is old. Models from 5+ years ago don't take advantage of WiFi 6 or the real speed of gigabit fibre. Ask your operator for a new one (usually free for long-standing customers) or replace it with your own.
• There's congestion in the neighbourhood. Especially with technologies like FTTC or copper. Call your operator and ask them to check your line's latency and speed — they may detect faults or saturation.

In any case, if after checking all of the above your fibre is still bad, switching operators is a real lever. Real speeds in independent tests vary a lot between Movistar, Vodafone, Orange, MasMovil and the MVNOs (Simyo, HitsMobile, Lowi) — and switching is free and commitment-free on many plans.