Why do routers have so many antennas?

There's an easy cynicism in looking at a router bristling with external antennas and assuming it's a marketing department's fantasy come to life. But the Engadget piece (https://www.engadget.com/2251223/why-routers-have-many-antennas/) does a good job grounding the explanation in the actual constraints of radio frequency engineering. The core mechanism is MIMO—using multiple antennas to send independent data streams that bounce off walls and ceilings, arriving at the client at slightly different times. The receiver uses those differences to reconstruct a faster, more robust signal. This is not snake oil; it's the same spatial multiplexing trick that underpins 4G and 5G cellular networks. What's particularly interesting is how this trend interacts with the shift to higher frequency bands. The 6GHz band introduced with Wi-Fi 6E is a double-edged sword: it offers vast amounts of clean spectrum but behaves poorly around obstacles. More antennas mean more spatial streams to compensate for that fragility. As the article notes, even mid-range routers now pack six or eight antennas, and while some of that variance is due to different bands (2.4GHz, 5GHz, 6GHz) each needing their own radiators, the trajectory is clear—consumer hardware is absorbing the lesson the cellular industry learned years ago. That said, there's a diminishing returns story lurking here. Most client devices—laptops and phones—still ship with two or three antennas at best. A router with eight spatial streams is only as good as the weakest link in the chain. For the average household, a 2x2 MIMO setup over a single band is often plenty. The antenna count becomes a spec-sheet arms race, but it is at least rooted in legitimate engineering, not theater. The real bottleneck has quietly moved to spectrum congestion and interference, which no number of antennas can fully fix. Still, this is one of those rare cases where consumer hardware's marketing push actually aligns with where the technology is heading. As Wi-Fi 7 matures and 320MHz channels become common, those extra antennas will earn their keep. The Engadget piece is a useful, non-technical primer that separates the physics from the hype—exactly the kind of context that makes the endless antenna count useful to decode.