I am running a Buffalo G PCMCIA wireless card which also uses the Broadcom 
drivers. I, with a fresh install of Hardy, get the same behavior as the OP. The 
output from dmesg is:
"[ 390.486921] b43-phy0 ERROR: Firmware file "b43/ucode5.fw" not found or load 
failed.
[ 390.486938] b43-phy0 ERROR: You must go to 
http://linuxwireless.org/en/users/Drivers/b43#devicefirmware and download the 
correct firmware (version 4).
[ 407.562781] input: b43-phy0 as /devices/virtual/input/input25
[ 287.630413] b43-phy0 ERROR: Firmware file "b43/ucode5.fw" not found or load 
failed.
[ 287.630427] b43-phy0 ERROR: You must go to 
http://linuxwireless.org/en/users/Drivers/b43#devicefirmware and download the 
correct firmware (version 4)."
and from "lsmod | grep b43"
b43 118176 0
rfkill 8592 19 rfkill_input,b43
mac80211 165652 1 b43
led_class 6020 1 b43
input_polldev 5896 1 b43
ssb 32772 2 b43,ohci_hcd
"
Again, the system acts like there is a wireless card and that it is active but 
no lights come on for the card and no wireless networks (I'm positive that 
there are several in the area) show up.

-- 
broadcom wireless not working fresh install of hardy
https://bugs.launchpad.net/bugs/197819
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