I'm working on improving the wifi coverage for a friend at an outdoor camp. The attached image shows the current setup and what I'm thinking about doing. To give an idea of scale, the distance from "A" to "B" is 100 meters (~330 feet). I'm looking for any feedback on the plan as this is my first experience with any outdoor wireless setup, or any setup with more than one access point for that matter.
"A" is where the current router and antenna are. They are currently using a D-Link DSL-G664T with a semidirectional antenna (looks like a semicircular panel antenna of some type). Its current coverage is roughly shown in red. As you can see it reaches many of the cabins, but there are 8 larger cabins on the left and some smaller ones on the right that receive little to no signal, and things get dicey in the trees. My first goal is to try to improve the coverage to the large cabins on the left. The pool and tennis courts are a "nice to have", but the pool for example is behind a large building from the main access point and the tennis courts are obscured by the roof where "A" is located, making those seemingly hard to cover.
What I'm thinking for now is to put a second access point, a D-Link DWL-2100AP with an outdoor vertical omnidirectional antenna at the cabin pointed to by "B" and to tie it to the main access point using WDS. (Actually, I would add two new DWL-2100APs, one to replace the access point function of the DSL-G664T at location "A" and one at "B" because the existing DSL-G664T does not support WDS). I chose the DWL-2100AP mainly because I have access to some relatively inexpensive ones. In theory the coverage around "B" would be something like what's highlighted by the blue area, which would hopefully cover those 8 cabins on the left.
I have a few questions about the setup:
1) I'm concerned about the signal at "B" within the actual cabin where the roof antenna is installed, because as I understand it, the vertical omnis don't transmit well in the vertical plane. Is this true and does anyone know if this will be a problem?
2) Does anyone have experience with WDS or these routers? As far as I can tell, this looks like a reasonable way to expand coverage (effectively add a repeater) without having to run an ethernet cable between A and B. I realize that wireless bandwidth will be cut in half by the WDS, but it will still be much faster than the DSL connection.
3) Any thoughts on a reasonably inexpensive way to cover the entire area, including the pool and tennis courts? I'm not sure how coverage is typically expanded in an all-wireless situation like this, with additional WDS routers? Or using some other mesh routers or something?
You will get much better results using 2 radios instead of a WDS repeater that is trying to share 1 radio. With WDS you loose 1/2 the bandwidth per hop + you can not use directional antennas for the uplink.
antenna choice for outdoor camp 
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