I have a D-link wireless router and a Linksys unit also. There are three desktop computers in the home. First is in finished basement with wireless router and is hard wired via ethernet cable. Second and third computers are in second floor bed room. Do to weak signal to these units from basement location we ran a ethernet cable upstairs to a room across from where these two computers are used. We set a wireless router in this room to feed the two computers. This is a line of sight signal of about 35-40 feet. The signal is poor at best running 40 -50 % and continues to drop. This is a D-link DI-524 router, one computer is using a D-link card and the other a Linksys card. Both computers (different wireless software) are showing the same weak signal. I have tried everything I can think of from changing to every channel available etc. I even removed the D-link router and installed the Linksys in its place with no improvement. I do not understand why the signal is running this low when the units are line of sight and only 35' apart? Does any one have an answer for this one? Tech support from both companies just want to do the standard "Lets try this" routines. Both units are rated to about 300' normally so why can't we get this short distance to work? This is in a standard home so I don't think its an interference problem. Any help would be appreciated as this one is getting to me!!
It's hard to solve such a problem over the Internet, but I have the following tips:
1. Try to move the whole wireless stuff ( Router and PCs) to an other location in the house ( the basement for example) if you still get low signals, try another house or office!
2. Check for external wireless effects like : high power GSM stations or so.
3. Try a MIMO wireless router this time which outperforms normal wireless routers with multiple anntenas and new transmission technology:
Poor wireless same room? 
Linear Mode
