When Macook Air is connected by wired (LAN) to my Linksys WRT54GC router, my connection speed measures (at testmy.net) around 4.2 Mbps, but if I use the wireless (WLAN) I only get less than 2.0 Mbps. *upload speeds are roughly the same for both wired and wireless connections. Firmware: v1.05.7 Leopard OSX 10.5.2 DSL modem (pppoe): SpeedStream 5200 Macbook Air right next to the router (roughly 1 meter away). Any fixes/patches/ suggestions is much appreciated? Here is what I tried in Wireless Settings: Set to Mode: G-only -> no change Renamed SSID -> no change Wireless Channel: tried from 1 to 11 --> no change Disabled wireless security (no WEP, WPA etc) -> no change Wireless Mac Filtering: at default -> no change Set Fragmentation Threshold to 2306, RTS Threshold to 2307 and Beacon Interval to 50 -> no change (Also, tried them in default settings -> no change) The rest of the router settings are at default.