I have a d-link 614+ and I just recently mounted a 11dBi 90 degree vertical sector panel antennaI had a similar problem, though the distance was much less: ~25 ft (5 feet between buildings, AP in my window sill, client 20 feet beyond a window opposite mine with LOS more or less to AP). The interesting bit was that when our windows were open, the signal was strong and fine.
http://www.superpass.com/SPDG13F.html I am merely trying to get the signal across the street to my
neighbor which is no more than 75 feet across, with a window to the living room.
After moving the AP outside and mounting a homebuilt 5dBi omni the client finally got a reliable signal. I've heard that dual-pane windows are coated with something that wi-fi doesn't like. Try having your neighbor open his/her window and see if the signal becomes reliable. If so, your neighbor will likely need a directional antenna of his/her own, or a warm sweater.
Hope this helps,
Tony Del Porto
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