Contemporary rates of WiFi (802.11) adoption have turned the technology into an oft-underestimated source of potential security breaches. Even though the lay user base typically feels protected by employing basic encryption (first WEP, then WPA and currently WPA2), the truth is that it is trivially easy to perform a multitude of attacks on typical home and small business setups. This paper will cover the danger of a MITM attack – and others - as well as fairly straightforward steps one might take to prevent similar intrusions by implementing a basic WIDS setup with off-the-shelf hardware and open source software. The final part will try and assess the practicality of such an approach through an attempt to build one with easily available hardware and software. The conclusion will hinge on whether contemporary router hardware can compete with the newest low-cost and low-power computer alternative.