Ubuntu :: WLAN Is Not Found?

my netbook doesn't see my HomeWlan, but like every other int he neighborhood. I am using a live-usb atm because i want to check if everything works out bevor i completely install ubuntu.

Details: I want to use my home-WLAN but Ubuntu doesn't see it, which is quite fascinating because it does see a bunch of other which belong to the neighbors. The second quite interesting part is that when i switch to windows i can connect without any problems (and yes it does see it as well). Any clues what might cause that behavior? My only guess is that the adapter broadcasts on a false Channel, but i aint sure about that. I entered "sudo iwlist chan" and the output is:

Code:
lo no frequency information
eth0 no frequency information
eth1 14 channels in total; available frequencies :
//bunch of frequencies
current channel 1

So i guess my adapter broadcasts on channel 1, but my router does on channel 6 (I am sure about that part). But when i tried to "fix" it with "iwconfig eth1 channel 6" and then i check the channels again, it is still on the same on (Channel 1). Well, i do have a second guess but this one seems even more unrealistic than the first one, it might be possible that my adapter isn't strong enough to get the signal, even though there are just like 2 1/2 Walls between. But this scenario is really unlikely because my netbook is getting so much other signals.