Microwaves, Fish Tanks and Mirrors Disrupt WiFi, Often on 2.4 GHz Networks

Q: Has Wi-Fi 7 technology finally outsmarted the physical 'Bad Boys' that have plagued our signals for decades?

No. Wi‑Fi 7 has not defeated the physical “Bad Boys of Radio” that Alex Hills identified; it has mainly become better at coping with them. The core limits remain the same. Water still absorbs radio energy, so fish tanks, people, humidity and rain can weaken signals. Brick, concrete, stone and metal still block or reflect them. Mirrors and large screens still create multipath problems. Older microwaves and other 2.4 GHz devices can still interfere. Those are physics problems, not software problems. What Wi‑Fi 7 does improve is efficiency and resilience. Its Multi‑Link Operation lets compatible devices use multiple bands at once or switch intelligently between them, which helps when one band is congested or degraded. Wider 320 MHz channels, higher 4096‑QAM modulation and better capacity handling can deliver faster speeds, lower latency and more stable performance in busy homes. But Wi‑Fi 7’s biggest speed gains often rely on 6 GHz spectrum, and that band is generally worse at penetrating walls and floors than 2.4 GHz. In other words, Wi‑Fi 7 can reduce the impact of interference and congestion, but it does not make signals pass through concrete, water or metal more effectively. The practical fix is still network design: place the router centrally and high, avoid obvious interference sources, and use extenders or, more effectively, a mesh system. In many homes, a Wi‑Fi 7 mesh setup is the real upgrade—not because it beats physics, but because it routes around it.

1 articles · Updated · BBC.com · Jul 9

2.4 GHz WiFi can be disrupted by everyday household items, with older microwaves among the most significant interference sources because they use the same frequency band.
Water and dense materials weaken signals through shadowing: fish tanks, brick and concrete walls can create dead zones, especially when they sit directly between a router and a device.
Mirrors, large TVs and metal-backed walls can reflect radio waves away from users, adding another common cause of patchy coverage inside homes.
Placing a router centrally and high up, switching to 5 GHz, or adding extenders or a mesh system can improve coverage without changing room layouts.
Severe winter weather can also cut connectivity beyond the home by damaging cables or blocking satellite links, while heavy indoor streaming can slow networks during storms.