My router is Linksys WRT54G and the problem was frequent random interruptions in WLAN connection. My expierence was that the 770 using G-only- or mixed-modes worked OK with distances less (!) than 1-2 meters though my portable PC (Acer)
worked everyware in my house. Updating the WRT54G-firmware didn't help. But using B-only-mode caused no interruptions. The reason for that behaviour is (my?) 770's
WLAN-insensitivity or/and its inherent slowness. (=?) Therefore I don't see any particular configuration possibilities.
If it is the slowness, then it may be worthwhile to try no encryption because encryption needs extra calculation power.
(Regarding security without encryption I still think that if WRT54G is firstly selected not to send SSID, is enough, because - at least in my case - the router doesn't expose itself outside about 50 meters' radius and I know everybody inside this radius. Secondly, MAC-addresses, limiting allowed users of my WLAN to my 770 and portable PC only, builds up a quite adequate security without causing the need of continuous
extra processing power for encryption.)
Well, this is not a proofed idea.
BTW, this ideal situation existed with OS2005. OS2006 works similarly but has brought irritating unnecessary interruptions often when switching from an application using
WLAN to another.