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A meeting room where the video call stutters whenever somebody walks past. A warehouse scanner that drops out in aisle nine. A home office with three bars in the doorway and one at the desk. Complaints like these are rarely about faulty hardware. More often the access point has been installed somewhere convenient for whoever was running the cable, rather than somewhere good for the radio.
Wireless is a physical medium. Walls, metal, water, height and even the bodies in the room all shape the signal before a client device ever sees it. The good news is that placement mistakes repeat themselves, and most are cheap to correct once you know what to look for.
The most common error is treating an access point as something you fit to the nearest available network point. A cable run ends in the corner of the room, so the AP goes in the corner of the room. A comms cabinet has space, so the AP lives inside it. Neither choice has anything to do with where clients actually sit.
Run the cable to the access point, not the access point to the cable. A drum of cable and an extra hour on the ladder costs far less than a repeat visit, and far less than the work lost in a room that never quite functions. Keep APs out of metal cabinets, risers, cupboards, floor-level corners and the space behind a wall-mounted television. A steel enclosure is a metal box, and radio waves do not care how tidy it looks.
Most ceiling-mounted access points use internal antennas that radiate outwards and slightly downwards, a bit like a flattened doughnut. That pattern assumes the AP sits above the people using it. Fix the same unit to a wall in the corner of a room and roughly half its output goes straight into the masonry.
Wall-plate APs are built for the opposite job: their coverage is shaped to fire away from the surface they are fixed to. Swapping the two — a ceiling AP on a wall, a wall AP on a ceiling — produces a design that looks fine on a plan and disappoints in practice.
Suspended ceilings are tempting hiding places. Foil-backed tiles, metal grid, ducting and cable trays all sit between the AP and the people it serves, so the signal leaks through gaps instead of covering the room. If an AP must live above the ceiling, fit it in place of a tile rather than behind one.
Very high ceilings bring their own problem. In a warehouse or an atrium, a ceiling-mounted AP may have a clear line of sight to the floor and still struggle to serve a handheld scanner at ground level, because the angle and distance are unforgiving. Lower mounting on racking or a column, or a directional antenna, often works better.
Signal loss is cumulative, and some building materials are far worse than others. Before finalising a position, look at the path between the AP and the clients, not just the distance.
It helps to remember that 2.4 GHz travels through walls more readily than 5 GHz. That does not make it the better choice: 2.4 GHz is more congested, offers fewer non-overlapping channels and usually delivers lower throughput. Move a whole design down to 2.4 GHz to solve a coverage problem and you often create a performance problem instead.
When a room has weak signal, the instinct is to increase transmit power. It rarely helps, because Wi-Fi is a two-way conversation. A louder access point can reach a laptop that the laptop cannot reach back. The client's reply is lost, the connection stalls, and the device clings to the distant AP even when a closer one is available.
Higher power also raises the noise floor for everyone, increases co-channel interference and makes roaming worse. The better answer is usually the opposite: add another access point, then turn the existing ones down so each covers a smaller area well. Local rules set the maximum permitted transmit power and it varies by country, so stay within whatever your equipment and regulator allow.
A wireless network is a shared medium. Every device on one access point competes for the same airtime, so an AP showing excellent signal strength can still deliver poor performance once twenty or thirty clients are active on it. Coverage and capacity are different problems, and only one of them is solved by moving an AP.
Busy spaces — lecture theatres, open-plan offices, cafés, exhibition halls, hospital wards — need more access points at lower power, not fewer at higher power. Aim for a design where each AP serves a modest number of devices with strong signal, and where adjacent APs overlap just enough for a clean handover. If your plan shows a single AP covering an entire open-plan floor, you have a capacity problem waiting to happen.
Floor-plan predictions are a starting point, not an answer. Building materials are rarely what the drawings claim, and a plan cannot tell you about a filing cabinet, a new partition or a neighbouring network blasting through the wall.
Walk the space before installation with a laptop and a Wi-Fi scanning tool, then walk it again afterwards with real client devices. Look at signal-to-noise ratio and throughput, not just the bars on the screen. Test in the conditions that matter: lunchtime in the staff canteen, a full meeting room, a shift change on the factory floor. Record what you find, because the next person to touch the network will need it.
Good wireless design is mostly a matter of order: understand the demand, plan, install, then verify. A short checklist covers most of it.
Photo: abedaljalil / Pixabay
