Better Wi-Fi Coverage: What Actually Helps

Most coverage complaints are solved by moving the router. The rest are solved by understanding what the bands do. Buying equipment comes last, and by then you will know what to buy.

Why coverage varies

Wi-Fi is radio, and radio is absorbed and reflected.

What blocks it badly: water — including people, aquariums and pipes — metal, concrete, brick, tiles, mirrors, and foil-backed insulation. A single foil-backed wall can stop a signal almost completely, which is why some modern houses have worse coverage than older ones.

What barely matters: open air, plasterboard, wood, glass.

Distance matters less than what is between. A router two rooms away through open doorways beats one in the next room behind a tiled wall.

Interference from microwaves, cordless phones, baby monitors and neighbouring networks degrades the signal without blocking it.

Position: the free fix

Central. The signal radiates outward, so a router in a corner sends most of it to your neighbours.

High. On a shelf, not the floor. Signals spread downward and outward more readily than upward.

Out in the open. Not in a cupboard, not in a media cabinet, not behind the television. Enclosures absorb signal and trap heat, and a hot router performs worse.

Away from metal and water. Not on top of a radiator, not next to the fridge, not beside a fish tank.

Away from the microwave, which transmits in the same band as 2.4GHz Wi-Fi.

Antennas, if external, positioned in different planes — one vertical, one horizontal — which helps devices at different heights and orientations.

Try before committing. Move the router temporarily and test in the problem area. A long ethernet cable to a better position is cheaper and more effective than any extender.

The two bands, and why it matters

Modern routers broadcast on both, and understanding the difference explains most coverage confusion.

2.4GHz travels further and passes through walls better. It is slower, and it is crowded — many household devices use it.

5GHz is considerably faster and travels less well, particularly through walls.

6GHz, on the newest routers, is faster again and travels least well of the three.

The practical consequence: close to the router use the higher band, further away use 2.4GHz. Most routers now present one network name and steer devices automatically, which usually works and occasionally does not.

When a device clings to a weak connection, the automatic steering has failed. Separating the bands into two named networks lets you choose manually — useful for diagnosis, less convenient day to day.

Channels and congestion

In a flat or a dense area, your neighbours' networks are your main interference source.

2.4GHz has three genuinely non-overlapping channels in most regions — 1, 6 and 11. Anything else overlaps with two of them.

5GHz has many more channels, which is part of why it performs better in dense areas.

Most routers select automatically, and some do it once at startup and never again. If coverage degraded over months, forcing a re-selection or choosing manually can help.

A Wi-Fi analyser app shows which channels are busy around you. Free, takes two minutes, and it turns guesswork into a decision.

Settings worth checking

Transmit power, on routers that expose it. Should be at maximum unless you have a specific reason.

Band steering, which moves devices between bands automatically. Usually helpful. Turn it off if devices behave oddly.

Older standards support. Some routers slow the whole network to accommodate very old devices. If nothing you own is more than a decade old, disabling legacy support can help.

Firmware, kept current. Coverage and stability improvements arrive in updates.

Guest network, which does not affect coverage and is worth having anyway.

When to extend, and how

Once position, band and channel are handled.

Mesh

Several units sharing one network name, handing devices between them as you move.

The right answer for most homes that genuinely need more coverage. Devices roam without dropping, and the units coordinate rather than competing.

Wired backhaul is much better than wireless if you can run a cable between units — the wireless link between mesh points otherwise consumes capacity.

Cost is the drawback, and mesh systems are considerably cheaper than they were.

Extenders

A single unit that rebroadcasts the signal.

Cheaper, and worse. The classic problem: the extender receives and retransmits on the same radio, roughly halving throughput. And it typically creates a second network name, so devices do not switch automatically and cling to the weak original.

Where an extender is fine: one dead spot, undemanding use, low budget.

Place it halfway between the router and the dead spot, where it still receives a strong signal. Placed in the dead spot itself, it rebroadcasts a weak signal, which is the most common mistake.

Powerline adapters

Send data through the mains wiring. Useful where running a cable is impossible and walls block Wi-Fi.

Performance varies enormously with the wiring — same circuit, good; across a consumer unit, poor. Do not use with an extension lead.

Access points

A second router or dedicated unit, connected by cable, broadcasting the same network.

The best result if you can run a cable. Full speed, no halving, and no compromise.

Outdoor coverage

Position first. A router near an external wall on the relevant side does a lot.

A window is largely transparent to Wi-Fi; a wall is not. A router visible from the garden through glass performs better than one two rooms in.

Outdoor access points exist, weatherproofed, connected by cable. The proper solution for a large garden.

A standard indoor unit outdoors will fail. Moisture and temperature swings destroy consumer equipment quickly.

Consider what you actually need it for. Streaming on a patio is a different requirement from a video call at the end of a garden.

Diagnosing a coverage problem

Measure before changing anything. A Wi-Fi analyser app shows signal strength in each room. Record it, so you can tell whether a change helped.

Test speed at the router and in the problem area. If both are slow, the problem is the connection, not coverage.

Check whether it is one device or all. One device with poor reception is a device problem.

Check at different times. Intermittent problems point at interference or congestion rather than coverage.

The short version

Move the router first. Central, high, out in the open, away from metal and water. It is free and it is usually enough.

Higher bands are faster and travel less well. Close to the router, use them; further away, 2.4GHz.

In a flat, check the channel — a Wi-Fi analyser app makes this a two-minute job.

Mesh over extenders where you can afford it, and wired backhaul if you can run a cable.

And place an extender halfway to the dead spot, not in it — rebroadcasting a weak signal is the commonest mistake in this whole area.

For background on Wi-Fi standards and certified capabilities, see Wi-Fi Alliance.