extending wifi signal - advice on setup of wifi biquad antenna

Hi All

I want to give my neighbour internet access from my internet connection

its about 80 meters away, but there are a lot of thick trees in the way (see image)

I have the following equipment at my disposal

2 x Edimax AP's
1 Netgear router
1 Edimax router
1 double biquad wifi antenna

The internet comes into the Netgear, and i have 2 wireless access points i can use.
I was planning on putting one in their house on repeater mode, and one on the edge of my house (closest to them)

however, i've been playing and the signal doesn't make it through the tree's. so i've now got a double biquad wifi antenna at my disposal

my questions are

Where do i mount the dish? (mine or theirs)
can i use this to transmit the wifi signal?
or do i need it to receive the wifi signal?

will the tree's at this short distance stop it? (i.e. does it have to be line of sight?)

I don't have the pigtail cable yet
I bought the biquad antenna off ebay, and it didn't come with a pig tail cable
What cable do i need to go from the antenna to the router/AP?
And what length does it have to be (i've seen 1 meter ones, but i'd need a lot longer than that if i want to mount the dish on the wall
What length can i get away with??

The above is my summary of what i THINK i need to do, however, i'm no expert at this so please explain a better setup with the equipment i have.
I'm in Africa, so parts aren't readily available, and I have to work with what I have

Thanks for your time
Mark

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