This is a generic answer for ALL linksys routers. First of all try updating the firmware. Linksys may have tweaked or fixed a problem with the wireless signal and therefore a new firmware may help. Position the Router in the highest place possible. dont put it in the basement. Try using channel 1, 6 or 11 first of all or 1, 6 13 in EU (ETSI standard) none of these 3 channels have cross coverage unlike the rest of the channels as they all overlap into other channel ranges and this will cause interferance. to any tranmitted signal. If your wireless devices are all 54G then if possible set your router to G only. if not set Wireless to B only (unless you have B and G devices) though B mode will give better signal than G Adjusting the "RTS Threshold" can help alleviate Packet loss. If one of the Wireless computers can obtain an IP address but can not ping, then set the "RTS Threshold" to 2304 Adjusting the "Beacon Interval" can help association problems. If there is a wireless adapter that is able to see the access point, but is unable to get locked, try adjusting the "Beacon Interval" to 50 Adjusting the "Fragmentation Threshold" can help association problems. If there is a wireless adapter that is able to see the access point, but is unable to get locked, try adjusting the "Fragmentation Threshold" to 2304 If you have just one or two clients enabling frameburst will help. Make sure CTS is disabled. (WRT54G/GS only) Try WEP security instead of WPA as signal strength seems to be reduced in WPA. however WEP is less secure. If your PCI wireless adapter is still having problems this may be down to a IRQ conflict. Try moving your PCI network card to a different slot on your Motherboard. ALos changing Drivers may help. Also adding a Directional Antenna to your wireless PC's will help in reception. The DLink DWL-M60AT is a very good example of a Directional antenna that can be added to most Wireless PCI Network cards with easy and gives better reults than boosting a signal via a firmware upgrade. WRT54G/GS and WAP54G ONLY There are a number of 3rd party firmwares that have been developed which will allow you to adjust the signal strength output of the routers. check the downloads for such firmware upgrades. , HyperWRT, DD-WRT, HyperWAP, EWRT, MustDie WAP, Sveasoft and, WifiBox projects all have various firmwares for the signal strength tweak. make sure your router model and version number will work with the router in question. The default for most linksys Routers is 18mW. you cna increase this drastically with a 3rd party firmware Putting the transmittion rate beyong 100mW is illegal in ETSI standards. 251mW is obtainable from the WRT54G but this can serously damage your health. so please dont do it. One other thing: The signal strength maybe adequate but the reception is the problem. you can sometimes gain better signal strength by adding a reflector than adding any bigger antennas. For more information about making a reflector checkout this website. Free Antennas Here are is a short list on common causes of interference: WINDOW IN BRICK WALL = 2dB METAL FRAME, GLASS WALL INTO BUILDING = 6dB OFFICE WALL = 6dB METAL DOOR IN OFFICE WALL = 6dB CINDER WALL = 4dB METAL DOOR IN BRICK WALL = 12.4dB BRICK WALL NEXT TO METAL DOOR = 3dB Linksys suggests that you place your Access Point as high as possible. If your network goes through multiple floors, try to place the Access Point on the upper floor. If you want to connect while you're outside, place the AP near a window. Keep it away from large metal objects such as filing cabinets. Also, try to keep the AP's away from operating microwave ovens and 2.4GHz cordless phones. In addition, if you use 2.4 GHz phones and experience interference, try using a different channel on the phone.