there are lots of setting in the wireless cards. what card are you using.
i have practical experiance with atheros in pfsense and everything was better than
when using mono and older cardtry ifconfig and see that the stats are on the wireless card check to make sure the config is the one you put into the gui.
additionally try to setup wireless ssid etc from command line only and see how it looks
Thank you very much. I use card with intersil prism 2.5 chipset. Directly Z-com 626. I try command line.