Why your Wi-Fi struggles in the first place

If you have ever watched a spinning circle appear halfway through a video, or had a video call break up just as you were making your point, you already know how frustrating a weak Wi-Fi signal can be. The good news is that the problem is often solvable without spending a penny, and when you do spend, you rarely need to replace everything.

Wi-Fi is radio, and radio behaves a bit like sound travelling through a house. Walls, floors and even the water in your body absorb it. The thicker or denser the obstacle, the more signal is lost. Foil-backed plasterboard, stone walls, mirrors, fish tanks and metal-backed insulation are all particularly unfriendly. Distance and obstacles matter more than most people realise, and the router you were given by your broadband provider is not a powerful transmitter — it is a small, cheap one designed to be adequate in an average flat.

Understanding that helps, because it tells you what to fix first: where the signal starts, how it travels, and what else is competing for the same airwaves.

Put the router where the signal needs to go

Router placement is the single most effective free fix, and most homes get it wrong. The router tends to end up wherever the phone socket or cable enters the property, which is usually a hallway cupboard, a corner of the living room, or behind the television. That is close to the worst place it could be.

• Central and high. Aim for the middle of your home, ideally on a shelf around head height or above. Radio spreads outwards and slightly downwards, so a router on the floor sends much of its signal into the floorboards.
• Out in the open. Avoid cupboards, closed cabinets and anything stacked on top of it. A TV cabinet full of electronics is a noisy, shielded box.
• Away from metal and water. Radiators, fridge freezers, microwaves and fish tanks all soak up or distort signal. Keep at least a metre clear where you can.
• Away from the telly. Televisions, monitors and games consoles emit interference, and having the router right beside them also means the aerial is often pointing the wrong way.
• Angles matter. If your router has external aerials, point one vertically and one horizontally. That covers both laptop orientations reasonably well.

If your broadband entry point is stuck in a bad corner, a longer Ethernet cable is a cheap solution. Run it along skirting boards to move the router somewhere useful.

Set the aerials free and try the 5GHz band

Modern routers broadcast on two bands. The 2.4GHz band travels further and through walls better, but it is crowded and slow. The 5GHz band is much faster and cleaner, but it struggles over distance. Many people leave everything on 2.4GHz and wonder why speeds are poor.

Check your router settings for separate network names for each band. Put devices that stay put and need speed — smart TVs, consoles, desktop PCs — on 5GHz. Keep phones, tablets and smart plugs on 2.4GHz, since they roam around the house and benefit from the extra range. If your router only offers one combined name, most devices will pick sensibly on their own, but you lose the ability to choose.

Change the channel to escape the crowd

In busy streets and blocks of flats, everyone's router is shouting on the same frequencies. On 2.4GHz there are really only three non-overlapping channels: 1, 6 and 11. If you and four neighbours are all on channel 6, everyone suffers.

Log into your router's admin page — the address and password are usually printed on a sticker underneath — and look for the wireless channel setting. Set 2.4GHz manually to whichever of 1, 6 or 11 looks quietest, rather than leaving it on automatic. Automatic settings often settle on a channel at startup and never reconsider.

For 5GHz, channels are more numerous and less congested, so auto is usually fine. If you can, install a free Wi-Fi scanning app on a laptop or phone to see which channels your neighbours are using, then choose the emptiest.

Extend coverage sensibly with mesh or a second access point

If you have tried placement and channels and still have a dead spot at the back bedroom, you need more coverage rather than more power. A few options, roughly in order of cost:

• Powerline adapters. These push your internet through the household mains wiring and give you a wired or wireless point in another room. They work well in most homes, though performance varies with the age of the wiring.
• A spare router as an access point. If you have an old router in a drawer, connect it to your main router with an Ethernet cable and configure it as an access point. This is genuinely effective and costs only the cable.
• Mesh systems. Two or three mesh nodes create one seamless network that your devices roam between without dropping. Look for units that support a wired backhaul, so you can connect nodes by cable if you can run one.
• Wi-Fi extenders. Cheap and easy, but they halve your throughput and create a second network name. Use them as a last resort, not a first choice.

Small habits that keep things running well

Once your signal is sorted, a little maintenance keeps it that way. Restart your router every month or so by unplugging it for thirty seconds — this clears memory leaks and resets connections. Check for firmware updates in the admin page a few times a year, as they often include security and stability fixes.

Keep the router reasonably cool and dust-free, since overheating causes dropouts. And if you are still on an old Wi-Fi 4 or early Wi-Fi 5 router supplied years ago, an upgrade to a modern Wi-Fi 6 model is a sensible long-term investment. But do the free things first — placement, band and channel. In most homes, that is enough.