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Any of the antenna projects shown here will provide longer range,
lower required power for any data rate, and increased privacy
(lower sidelobe radiation). My suggestion, if your network
must penetrate concrete walls, runs from one building
to another, or covers a large outdoor area, is to use a
biquad or long helical antenna at both ends: access points
and clients must both support their ends of the
communications link.
For very long range, use a short helical or biquad
antenna mounted at the focus of a parabolic reflector.
Bear in mind that beyond a distance of 3 km, throughput may
begin to decrease due to the ACK timeout setting of the access
point. ACK timing must be optimized for longer distances -
especially over links covering dozens of kilometers.
Some articles to read that will raise your expectations
of wifi performance:
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