I have installed and am running a wireless bridge less then a km apart with crystal clear line of site. While configuring the bridge I had some old antennae from some intel wireless AP's and tested them side by side and got about 19-20Mbs. When I traded them out with the Cisco yagi antennae that rate dropped to 15Mbs, when I did the actual install the bandwidth dropped further to 10Mbs.
I am wondering if I am missing some optimization that can boost the performance, it seems weird that the using an old antennae for a different AP does better then the Cisco Yagi unless I just missed something. I have the set the antennae to 14 db gain(antnennae says 13.5) and it is set to external as well as set to use the least congested channels.