Signal strength is good:
$ iwconfig ath0
ath0 IEEE 802.11g ESSID:"eduroam" Nickname:""
Mode:Managed Frequency:2.472 GHz Access Point: 00:12:7F:50:A3:80
Bit Rate:24 Mb/s Tx-Power:8 dBm Sensitivity=1/1
Retry:off RTS thr:off Fragment thr:off
Power Management:off
Link Quality=43/70 Signal level=-50 dBm Noise level=-93 dBm
Rx invalid nwid:5057 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0
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High packetloss over Atheros wireless
https://bugs.launchpad.net/bugs/75866
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