Why Wi-Fi HaLow Reaches a Kilometre When Normal Wi-Fi Dies at the Barn Door

Anyone who's tried to stretch Wi-Fi across a site knows how quickly it gives up. It's fine in the office; it's gone by the time you reach the far building. The usual fix — drop a 4G camera with its own SIM wherever you need a view — works, but it means a data plan behind every camera, forever, and a real multi-camera site turns into a stack of monthly bills. Wi-Fi HaLow takes a different route. From a single gateway it holds a solid link to cameras up to a kilometre away, through walls and around buildings, with no SIM in any of them. That sounds like it shouldn't be possible from something called "Wi-Fi" — so here's what's actually going on, without the jargon. Last updated: September 2026. The range problem, in one line Normal Wi-Fi runs at 2.4 and 5 GHz. Those are high frequencies: fast, but short-legged and easily blocked. Push one through a steel-clad barn or across an open yard and it fades within tens of metres. 4G solves the distance by putting the whole internet on a SIM inside each camera — brilliant for one camera on a remote pole, punishing when you want twenty around a site. Enter 802.11ah — Wi-Fi rebuilt on sub-GHz radio Wi-Fi HaLow is the IEEE 802.11ah standard, and the important word is sub-GHz: instead of 2.4/5 GHz it works down in the 900 MHz band. It's still Wi-Fi — it carries IP, it's encrypted, your cameras and gateway just talk to each other — but moving it to a much lower frequency changes what it can physically do. It trades raw speed (which a camera stream doesn't need much of) for range and penetration (which covering a site needs a lot of). Why a lower frequency travels further — and through things Two bits of plain physics explain the whole thing: Lower frequencies carry further. A longer radio wave loses less energy over distance and bends around obstacles more readily than a short one. It's the same reason long-wave radio reaches across a country while your car loses a DAB station in a tunnel. Drop from 5 GHz to 900 MHz and the same power reaches dramatically further. Lower frequencies punch through structures. High-frequency signal is stopped by walls, steel and dense foliage; longer sub-GHz waves pass through them far better. That's why HaLow can reach a camera behind a building, not just one in clear line of sight. Put those together and one gateway can cover a whole site — the yard, the outbuildings, the gate, the far boundary — where ordinary Wi-Fi would need a chain of repeaters and 4G would need a wallet full of SIMs. One gateway, a whole fleet of cameras HaLow was also designed to hold many low-power links at once — it's built for the "hundreds of sensors on one network" world of industrial IoT. In CCTV terms that means a single gateway comfortably runs a fleet of cameras rather than one or two, and because the radio is efficient and low-power it suits solar and battery cameras out at the edge of a site. One hub, many cameras, no mesh of boosters to babysit. We covered building one of these networks from scratch in Wi-Fi HaLow CCTV: a private wireless camera network with zero SIM costs. Where it wins HaLow is at its best exactly where wiring is hard and signal is thin: Spread-out sites — farms, estates, yards, depots and compounds where cameras are hundreds of metres apart. Behind buildings — coverage that doesn't need clear line of sight to the gateway. Off-grid and solar — low-power links that suit battery and solar cameras at the far edge. Real multi-camera rollouts — where the whole point is lots of cameras, and per-camera SIM costs would otherwise kill the idea. If 1 km still isn't enough for a long boundary, optional high-gain antennas push the link further again — no extra gateways, no SIMs. The full setup is on our whole-site HaLow CCTV page, and the hardware is in the Wi-Fi HaLow range. The economics are the real headline The physics is what makes it possible; the running cost is what makes it sensible. Connectivity lives in one gateway on a connection you already pay for, so every camera after the first costs nothing to run. That's the difference between putting up the two cameras you can justify and actually covering the site — which, for most people, is the whole reason they were looking in the first place. Tell us the site — roughly how it's laid out and the furthest distance you need to reach — and we'll spec the gateway, cameras and any antennas to match, at trade pricing. Talk to our UK team. Free UK delivery over £75.