January 20, 2009 1:11 AM

Your problem may be due to interference/noise .... I would suggest you to go through the following link to set up your network properly :
http://www.myopenrouter.com/article/10184/Improving-Wireless-Range-for-the-WG...
http://www.myopenrouter.com/article/10180/Improving-Wireless-Range--Choosing-...

Hope it will help you ...