It’s true that some “alien devices” such as TV extenders etc use the
2.4GHz band as well. Especially the TV extenders can be a source for
interference since they use directional antennas with relatively high
gain. 
In most cases, it is possible to keep your home wireless network free
from interference. It all comes down to selecting the right channels.
What most people are not aware of is that you should try to use only
channel 1, 6 or 11 in a 2.4GHz band although 11 channels (FCC) or 13
channels (ETSI) are available. These three channels are non-overlapping
channels and so they can provide the full bandwidth available. Not
everyone will be able to “site survey” their home environment but there
are a few simple applications available that provide basic but useful
information in order to properly setup your home wireless. 

1.      NetStumbler: http://www.netstumbler.com/downloads/ This free utility
scans the environment for wireless networks. It will tell you on what
channels they are active. With this basic test you can see with channels
are occupied and so you can configure your own network to operate on a
free channel. If no channel is free, then select one were the used
signal is weak (low SNR level). 
NetStumbler is able to see networks that are not broadcasting their
SSID’s as well. It is a very good tool.
2.      Some Windows drivers provide basic channel information (like
NetStumbler) as well. For example: Intel, Toshiba etc. If yours doesn’t
provide it then use NetStumbler.
3.      Another one, more complex and chargeable, is Wi-Spy:
http://www.metageek.net/ Wi-Spy is also able to run a recording over a
longer period of time. This will provide you with a better view of what
is going on in the 2.4GHz band. We use this at work during site surveys
and when customers complain about response times. Works great.

Hope this helps.


-- 
Pascal Hibon

__________________________________________________
2 x SB3 - both wireless, ReadyNAS NV+ running SBS,
iPeng on iPod Touch.
------------------------------------------------------------------------
Pascal Hibon's Profile: http://forums.slimdevices.com/member.php?userid=7969
View this thread: http://forums.slimdevices.com/showthread.php?t=65719

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