When you do WIFI on laser you really should have at least one YAGI antenna with short, low loss microwave coaxial cable on one of the WLAN diversity ports. At both Ends. This may involve clamping and aiming the yagis, but it builds up your jam immunity.
If you could have Two Yagis at each end displaced a multiple of an odd integer number (> then 10) of wavelengths apart, well... 
If you don't have YAGIs you should at least install professional, high gain, stacked co-linear antennas.
The antennas on most routers have very poor antenna patterns so the channels can be reused by your neighbor.
At 2.4 Ghz common coax cable has huge losses. At 5.7 Ghz its far worse. One way to reduce this is to mount the router within inches of the YAGI.
This may violate your country's rules on Effective Radiated Power (ERP) but I like the piece of mind.
Steve
Last edited by mixedgas; 11-23-2014 at 15:36.
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When I still could have...