Well I second the cisco solution. I have a set of bridges ordered for a link almost the same as what you are describing. I spent 5 hours this weekend working with a networking friend trying to get his d-link 22 mbs (yeah right) 802.11b stuff working. It worked on the table, it worked across the room. We sat them in the window sills of the two buildings and could actually get a link a few times with attached antennas. We pulled the functioning Breezecom gear down, hooked the dlinks up to the gain antennas that were in use and we get no link. We swapped everything, wasted most of a day.
Short answer is I don't trust the cheap stuff. I'm sure we missed something because it is a short hop. However, with no way to read signal strength it wasn't possible to really align anything else. These little units come with a built in antenna as one of the two, and an external antenna for the second one (diversity system). No matter what we tried, it appears the units continue to use the little internal antennas. We could find no way to select just the external one (what i usually do with the breezecom installations).
So...he sent the D-link back, I'm going to try it with my cisco stuff when it arrives and then maybe go that way.
It is frustrating, but if you have to make this run and keep it running, I'd suggest quality like the cisco unless you need more speed.
Good Luck It is only my opinion, based on my experience and education...I am always willing to learn, educate me!
Daron J. Wilson, RCDD
daron.wilson@lhmorris.com