Reference
Wi-Fi Explained
These are the concepts that decide whether a purchase works. No networking vocabulary is assumed, every term is defined the first time it appears, and each page leads back out to the products it applies to — because an explainer that leaves you understanding the problem but not knowing what to do about it has only done half a job.
The five ideas that explain most Wi-Fi problems
If you read nothing else here, these five recur on nearly every page of this site.
- Higher frequency means more speed and less range. 2.4 GHz travels furthest and is slowest and most crowded. 5 GHz is much faster and dies sooner. 6 GHz is faster again and dies sooner again. Almost every symptom in home Wi-Fi is a consequence of that trade-off.
- A radio does one thing at a time. Which is why an extender that receives and then rebroadcasts on the same band passes on roughly half of what it got, and why thirty devices on one band take turns. Backhaul is this idea applied to mesh, and it is the most important page in this section.
- Wi-Fi is polite. A device listens before transmitting and waits if it hears anything. In a dense building everyone spends most of their time waiting, which is why your signal can be strong and your speeds terrible.
- Metal is worse than thickness. Foil-backed insulation and plaster on metal lath reflect radio far more effectively than much thicker brick absorbs it, which is why some thin walls behave as if they were opaque.
- Range has not improved for years. Transmit power is legally capped, so no new standard and no premium router reaches further than an old one. Every recent generation has improved how much data moves through crowded air, not how far it travels.
Worth knowing
Why we explain the mechanism rather than just the fix
Because the mechanism is checkable and the fix is not. If we tell you a cheap extender halves your throughput, you can reason about whether that matters for what you do in that room — and you can tell when our advice does not apply to your situation. A site that only gives you conclusions is asking you to trust it. One that explains the reasoning is letting you verify it. Given that we do not run a test lab and say so on every page, that is the honest way for this site to be useful. More on what we do and do not claim.
How the sections here fit together
The mesh explainers are about coverage: what backhaul is, how many nodes a house needs, whether the third band is worth paying for, and whether mesh slows your internet down. If you are considering a mesh system, read backhaul first — it is the specification that decides your result and it is the one nobody shops for.
The standards explainers are about generations: what Wi-Fi 6, 6E and 7 actually added, whether Wi-Fi 7 is worth it, and the difference between a modem, a router and a gateway. The recurring theme is that generations improve capacity rather than range, which means they are the wrong purchase for the most common complaint people have.
The buying explainers are decision guides: whether you need a new router, whether a new one will actually be faster, what mesh really costs, and how to replace a provider's gateway. These are the pages that will most often talk you out of spending money.
Where to go next
If you know your symptom, the diagnostic section is the faster route — every page there ends in a specific fix. If you know your house better than your symptom, start at by home type. If you have narrowed a purchase down to two options, the comparisons each end in a verdict rather than a table.
Start here if…
Coverage and mesh
The concepts behind every mesh recommendation on this site. Backhaul first — it matters more than anything else on a box.
Explainer
What Backhaul Is, and Why It Decides Everything
The single specification that decides whether a mesh system is good or disappointing, explained plainly.
Top pick · TP-Link Deco XE75 Pro
Explainer
How Many Mesh Nodes Do You Need?
A sizing method based on your actual house rather than the box's coverage claim — and why more nodes can be worse.
Top pick · TP-Link Deco X55
Standards and hardware
What each Wi-Fi generation added, and which box in your house does which job.
Explainer
Wi-Fi 7 vs Wi-Fi 6 vs Wi-Fi 6E
What each generation actually added, which differences matter in a real house, and which are marketing.
Top pick · TP-Link Archer BE9700
Explainer
Is Wi-Fi 7 Worth It?
Worth it for three specific situations, a waste for the most common complaint. Which one you have.
Top pick · TP-Link Archer BE9700
Deciding what to buy
The pages most likely to save you money, including by telling you not to spend it.
Decision guide
Do You Need a New Router?
Five tests that separate a genuinely tired router from a placement problem or a coverage problem.
Top pick · TP-Link Archer BE3600
Decision guide
Will a New Router Actually Be Faster?
When a new router genuinely raises your speed, and the three common cases where it changes nothing at all.
Top pick · TP-Link Archer BE9700
Common questions
Which explainer should I read first?
Backhaul, if you are considering any kind of mesh system or extender. It explains the single specification that determines whether the purchase works, and it is the one that is almost never advertised.
Do I need to understand any of this to fix my Wi-Fi?
No. The diagnostic section is written to be used without any of it. These pages exist for when you want to know why the advice is what it is, or when your situation does not quite match the standard case.
Why does range never improve between Wi-Fi generations?
Because transmit power is legally capped, so every consumer router sits at or near the same limit, and because the link is two-way — your phone transmits back far more weakly than the router does, and that return path is usually what fails first. New generations improve encoding and scheduling, not distance.