My mac doesn't pick up the signal strong and everybod elses PC does

I go to a school that has a wireless network on campus. My airport connection works fine when I am in a room with a signal router, but when I go to a room without a direct router my mac only pics up one bar! The frustrating thing is that all the PC laptops get the signal just fine.
What's going on? what should I do....

Check the photos in KB 108039, Properly attaching the antenna on an AirPort Extreme Card to ensure that the antenna wire is properly connected to the AirPort Extreme card in your iBook G4.

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here is what I have check:
ioky@Varius:~$ sudo iwconfig
lo no wireless extensions.
eth0 no wireless extensions.
eth1 IEEE 802.11b ESSID:"linksys" Nickname:"ipw2100"
Mode:Managed Frequency:2.437 GHz Access Point: 00:0C:41:84:3B:BE
Bit Rate=2 Mb/s Tx-Power:16 dBm
Retry short limit:7 RTS thr: off Fragment thr: off
Encryption key: off
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eth1 Scan completed :
Cell 01 - Address: 00:12:0E:0F:50:02
ESSID:"05B408577194"
Protocol:IEEE 802.11bg
Mode:Master
Frequency:2.437 GHz (Channel 6)
Encryption key: off
Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 6 Mb/s; 9 Mb/s
11 Mb/s; 12 Mb/s; 18 Mb/s; 22 Mb/s; 24 Mb/s
36 Mb/s; 48 Mb/s; 54 Mb/s
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Cell 02 - Address: 00:13:10:1B:71:54
ESSID:"Chidori"
Protocol:IEEE 802.11bg
Mode:Master
Frequency:2.437 GHz (Channel 6)
Encryption key: on
Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 6 Mb/s; 9 Mb/s
11 Mb/s; 12 Mb/s; 18 Mb/s; 24 Mb/s; 36 Mb/s
48 Mb/s; 54 Mb/s
Quality:37 Signal level:0 Noise level:0
IE: WPA Version 1
Group Cipher : TKIP
Pairwise Ciphers (1) : TKIP
Authentication Suites (1) : PSK
Extra: Last beacon: 212ms ago
Cell 03 - Address: 00:13:10:73:95:5A
ESSID:"ptak"
Protocol:IEEE 802.11bg
Mode:Master
Frequency:2.462 GHz (Channel 11)
Encryption key: on
Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 6 Mb/s; 9 Mb/s
11 Mb/s; 12 Mb/s; 18 Mb/s; 24 Mb/s; 36 Mb/s
48 Mb/s; 54 Mb/s
Quality:31 Signal level:0 Noise level:0
Extra: Last beacon: 0ms ago
Cell 04 - Address: 00:0C:41:84:3B:BE
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Encryption key: off
Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s
Quality:31 Signal level:0 Noise level:0
Extra: Last beacon: 208ms ago
ioky@Varius:~$ sudo dhclient eth1
Internet Systems Consortium DHCP Client V3.0.6
Copyright 2004-2007 Internet Systems Consortium.
All rights reserved.
For info, please visit http://www.isc.org/sw/dhcp/
Listening on LPF/eth1/00:0c:f1:3a:b5:02
Sending on LPF/eth1/00:0c:f1:3a:b5:02
Sending on Socket/fallback
DHCPREQUEST of 192.168.1.104 on eth1 to 255.255.255.255 port 67
DHCPACK of 192.168.1.104 from 192.168.1.1
bound to 192.168.1.104 -- renewal in 33768 seconds.
ioky@Varius:~$ sudo ifconfig eth1
eth1 Link encap:Ethernet HWaddr 00:0c:f1:3a:b5:02
inet addr:192.168.1.104 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::20c:f1ff:fe3a:b502/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:145 errors:0 dropped:0 overruns:0 frame:0
TX packets:175 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:16023 (15.6 KB) TX bytes:12958 (12.6 KB)
Interrupt:11 Base address:0x2000 Memory:cfffe000-cfffefff
ioky@Varius:~ ping google.com
ping: unknown host google.com
I have no idea what is going. could anyone give me a hand?
Thanks

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My mac doesn't pick up the signal strong and everybod elses PC does

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