I faced this issue today.
The rate is limited below 18 Mbps tested by iperf program
And I find many threads with similar question.
There are a lot of suggestions, such as changing rate, power..etc.
But all of this doesn't work at all.....
I just want to know if anyone has fixed this problem..?
Or should I give ath5k up and turn to Madwifi or ath9k???