I've recently been checking my new wifi router capabilities, and noticed something odd.

Whenever I check the signal strength, there is always another almost duplicate signal on top of the primary router signal (using Wifi Analyser App).

This ghost signal is named "Hidden", and even moves whenever I change the primary router's Channels.

Apart from the first pair of characters, this ghost signal has the same MAC address as the primary signal ... all other details are identical.

I've gone through the router settings and ensured no other signals or SSID's are in play.

Any ideas?