no wireless on inspiron 6400

Hi,
I just came upon an old inspiron 6400 and i'm trying to get the wireless internet on it.

i believe there's a "card" (maybe, Sierra  wireless aircard 580) missing and that would be why i cannot connect. could someone enlighten me with this old computer?

here's what i got on a linux command line
doom@Zombimatic / $ sudo /usr/lib/linuxmint/mintWifi/mintWifi.py
[sudo] password for doom:
-------------------------
* I. scanning WIFI PCI devices...
  -- Broadcom Corporation BCM4311 802.11b/g WLAN (rev 01)
      ==> PCI ID = 14e4:4311 (rev 01)
-------------------------
* II. querying ndiswrapper...
-------------------------
* III. querying iwconfig...
lo        no wireless extensions.

eth0      no wireless extensions.

-------------------------
* IV. querying ifconfig...
eth0      Link encap:Ethernet  HWaddr 00:19:b9:4d:af:be  
          inet addr:192.168.1.105  Bcast:192.168.1.255  Mask:255.255.255.0
          inet6 addr: fe80::219:b9ff:fe4d:afbe/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:1391 errors:0 dropped:0 overruns:0 frame:0
          TX packets:131 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:394332 (394.3 KB)  TX bytes:18371 (18.3 KB)
          Interrupt:17

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:22 errors:0 dropped:0 overruns:0 frame:0
          TX packets:22 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:2888 (2.8 KB)  TX bytes:2888 (2.8 KB)

-------------------------
* V. querying DHCP...
Rather than invoking init scripts through /etc/init.d, use the service(8)
utility, e.g. service smbd reload

Since the script you are attempting to invoke has been converted to an
Upstart job, you may also use the reload(8) utility, e.g. reload smbd
RTNETLINK answers: File exists
-------------------------
* VI. querying nslookup google.com...
Server:        67.55.0.11
Address:    67.55.0.11#53

Non-authoritative answer:
Name:    google.com
Address: 74.125.226.71
Name:    google.com
Address: 74.125.226.72
Name:    google.com
Address: 74.125.226.73
Name:    google.com
Address: 74.125.226.78
Name:    google.com
Address: 74.125.226.64
Name:    google.com
Address: 74.125.226.65
Name:    google.com
Address: 74.125.226.66
Name:    google.com
Address: 74.125.226.67
Name:    google.com
Address: 74.125.226.68
Name:    google.com
Address: 74.125.226.69
Name:    google.com
Address: 74.125.226.70