It's a modified 5 GHz WLAN. Some WiFi scanners are even able to see it. So for best results search for 5 GHz only WiFi antennas (not 2.4 and 5 GHz hybrids).What im trying to find out is what frequency the Wii U / Gamepad talks on, it could be anywhere in a 700mhz range which isnt helpful for antennas
Adding a reflector is actually a great idea to boost range (in one direction only). Maybe tuning the distance between the antennas and the reflector could give even better results.I am so proud of this community.