WNDR3800 wireless performance

After looking at wired performance, I've got a spin at wireless:
Test conditions were as follows:

Router Firmware Version: V1.0.0.24
PC 1: notebook with Intel PRO/Wireless 4965 AG
PC 2: desktop with nVidia Corporation CK804 Ethernet (Gigabit speed)
PC 1 was within one meter from the router

On PC 1:
# dd if=/dev/zero bs=4096 count=102400 | nc 192.168.1.31 1999

On PC 2:

# nc -l 1999 | dd of=/dev/null

Speed reported is from dd output on PC 1:

Speed	MB/s
2.4Ghz@54Mbs	2.6
2.4Ghz@130Mbs	8.1
2.4Ghz@300Mbs	9.3
5Ghz@300Mbs	9.0