Something I’ve learned in my time as a tech journalist is that Wi-Fi can be even more fickle than you might think. I discovered the hard way, for example, that you simply can’t run a smart home off of Wi-Fi 5, since its connection limits are so shallow that accessories will repeatedly get bumped offline. Try explaining that to your partner when they’re wondering why they can’t turn a light on.

Reliability really is the most important element in a home network these days. Speed matters, but it’s less of an issue now that many homes and devices are equipped with Wi-Fi 6 or 7, and it’s irrelevant if a device can’t maintain a solid link in the first place. One trick that can help is narrowing channel width — as long as you’re aware of its limitations.

3.5/5

Coverage

2500 sq ft

Number of Devices Supported

200+

What channel width is, and why narrowing it can help

Paradox though it might seem

While all routers divide their connections into 2.4, 5, and/or 6GHz bands, within those bands are the independent channels that your devices actually connect to. This is a broad analogy, but you can liken this somewhat to your car radio — you’re not just listening to AM or FM, you’re tuning into a specific frequency.

Channel width, as you’d expect, dictates how much data can flow within a particular channel. Under normal circumstances, it’s best to keep this wide. Devices like phones, laptops, and game consoles are demanding ever-increasing amounts of data, so narrowing their pipes tends to be counterproductive. As mixed reality headsets like the Quest 3 and Vision Pro shift from niche to mainstream, the expanded channel widths in Wi-Fi 7 are going to become essential.

The exception, of course, is if your network is dealing with chronic unreliability. If accessories like smart bulbs and gaming handhelds are repeatedly losing their connections, it might not be because they or your router are badly behaved — they’re just operating within the normal limits of the 2.4GHz band.

What’s so special about 2.4GHz? As it turns out, there are only three non-overlapping channels within that spectrum, and there are sometimes many, many devices competing for them. This is one of the reasons why it’s better to use Thread- or Zigbee- based smart home accessories whenever possible — they otherwise tend to crowd on 2.4GHz Wi-Fi. In fact Bluetooth devices can (occasionally) wreak havoc with 2.4GHz as well, since while they can’t connect to your router, they’re operating on the same band.

When channel width is set as wide as possible, that can paradoxically increase congestion. It makes plenty of sense, though, if you think of it in terms of highway traffic. A four-lane highway can handle thousands of cars per hour, but it’s going support far less than normal if a trailer is occupying two of those lanes, forcing everyone else to wait or go around.

How to fix the channel width problem

And when not to

Credit: Sleepsomatics

If you think it’s this 2.4GHz congestion that might be giving you grief, you’ll need to browse your router’s mobile or web interfaces for the appropriate settings. Unfortunately, different router brands use different menu systems, so there’s no universal set of instructions. The closest I can get is suggesting you look for Channel or 2.4GHz labels.

Once you’ve found the right channel width controls, lower 2.4GHz from 40MHz to 20MHz. Your router may need to restart for this to take effect, so don’t make the change unless you know no one else in your home is in the middle of something. If you have a mesh system, you may or may not have to adjust each router individually.

A very important note: leave 5 and 6GHz on Auto. Those bands are far less prone to the congestion and interference problems I’ve talked about, so all you’ll accomplish by shrinking their channels is limiting the potential of your most bandwidth-hungry devices. Certainly, I wouldn’t want to play something like Half-Life: Alyx if I wasn’t getting peak bandwidth out of my router.

One final comment to make is that some routers, such as Eero devices, don’t actually let you adjust channel width. Control is fully automatic, so your 2.4GHz channels might be stuck at 40MHz. You’ll just have to cross your fingers that device management is smart enough to work around any hurdles. Mesh systems could be better for channel issues in general, as long as you have at least two routers in range. A connection blocked or delayed by one router may be able to bounce to the other, even if it’s not at an ideal distance.