There are numerous options available for quickly and easily expanding your Wi-Fi coverage at home, using devices such as Wi-Fi repeaters (extenders) or Mesh systems. These devices promise a straightforward plug-and-play setup, stability, fast internet connections, and more. Are these claims true, and are these devices worth purchasing?

First and foremost, understanding how these devices operate is crucial. In the case of a mesh system, one of the node within the system needs to be wired to an internet source (such as a switch, router, firewall, etc.), which will then communicate wirelessly with all other nodes in the mesh system.
For a Wi-Fi repeater, any Wi-Fi source can be used, such as your existing Wi-Fi router, from which the Wi-Fi repeater obtains internet access and redistributes it to other devices.

Stability

Wireless solutions can match wired solutions only in specific scenarios—low interference, excellent visibility, and ideal directional alignment of both transmitter and receiver. Unfortunately, typical mesh system or repeater setups do not meet these requirements. Devices are often located in separate rooms, behind walls or furniture, diminishing the connection quality and increasing the potential for reduced stability during data transmission.

Speed

Most repeaters feature only one physical antenna, limiting them to sending and receiving data using a single piece of hardware, halving the speed. Repeaters also need to operate on the same frequency as the peer Wi-Fi transmitter, increasing interference and reducing speed.
While most Mesh systems function similarly to repeaters, more advanced Mesh systems can use different frequency ranges to transmit data between nodes, reducing interference and improving speed and connection quality.

Setup

The setup process for both mesh systems and Wi-Fi repeaters is generally straightforward.
Repeaters usually only require plugging into a socket and work immediately, with preconfigured Wi-Fi information provided on the device.
Mesh systems may be a bit more complex, typically requiring the use of mobile apps to set up Wi-Fi names, passwords, and additional nodes for an extensive mesh system.
Generally, these devices do not necessitate professional installation, and common users should be able to set them up easily.

Security

Due to their simple setup and limited administration options, these devices are often vulnerable. Users frequently retain default passwords for both Wi-Fi and the administration interface, and firmware is often outdated with no option for upgrading to the latest version. In some cases, manufacturers may not release new firmware versions, further compromising device security.

Conclusion

Using Wi-Fi repeaters or Mesh systems is advisable only when no other option exists for extending Wi-Fi coverage, especially in situations where network cables are unavailable or cannot be installed. In all other scenarios, it is recommended to opt for a professionally installed wired Wi-Fi system (e.g., Unifi, FortiAP, Aruba, Cisco Meraki, Juniper Mist), which can offer faster speeds, better stability, and enhanced security.