If you have a Linksys Router model WRT54G you can get a MUCH better firmware than Linksys povides. Http://www.Sveasoft.com You can increase the output power of the transmitter to gain better range power boost to 251 mw from 28mW. If you want the firmware contact me I have an account on there site and get the firmware free.
The firmware provides the following features
Current Alchemy feature additions:
Hotspot portal
PPTP VPN server
Two-way bandwidth management (includes P2P, VoIP, IM)
SSH client and server
Telnet
Startup, firewall, and shutdown scripts
WDS repeater mode
Client mode (support multiple attached devices)
Adhoc mode
OSPF routing
RIP2 routing
Power boost to 251 mw from 28mW
Antenna select
Static DHCP address assignments
Additional DDNS support
Wireless MAC address clone
VLAN support (hardware only)
WPA over WDS
WPA/TKIP with AES
Client mode WPA
Client isolation mode
P2P blocking/bandwidth management (Gnutella, Kazaa, etc)
Port triggering
Wake-On-Lan
Remote syslog
Remote Ntop statistics
SNMP
Safe backup and restore
Reset on firmware upgrade
Status includes system uptime and load average
Status for wireless clients and WDS
Site survey
Remote NTP server support
Supports new WRT54G V2.2 and WRT54GS V1.1 models