Typical client-to-client throughput through Linksys WAG54G router ?

Hello,

I replaced my Alcatel ADSL gateway and WLAN router with an all-in-one
Linksys WAG54G router, and my computers got WMP54G (PCI) or WPC54G (PCMCIA)
adapters. Everything works fine, router config was a breeze, SSID broadcast
disabled, static IPs on all machines, WEP enabled.

I replaced the antennas on the WMP54G (PCI) adapters with D-Link's DWL-M60AT
directional antennas, and my 2 computers at the extreme ends of the
apartment get an excellent signal at 54mbps, same as my laptop about
anywhere in the house.

One of the machines acts as a web server and a ftp server, and the other
computers connect to it with an ftp client or with remote destop to use its
content.

When downloading a big file using FTP (> 500MB), the typical transfer speed
is around 12-14 mbps, in other words about 1.4-1.5 MB/sec. This is far
better than what I got using the my old DLink WLAN router, and for my home
use, it's more than enough. However, this is far from the advertized
theoretical maximum of 54 mbps.

I tried various settings on the router and WLAN cards, forcing transfer
rates to other values, changing from "max performance" to "max range",
changing channel (since I have wireless phones and wireless TV signal
transmitters in the house), but the 13-14 mbps is as fast as it seems to
get. With default antennas the transfer rate was a noticeably lower (about
20%).

I don't need a faster connection, but is this a typical value I am getting ?

Lorenzo