03-24-2006, 03:53 AM
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Join Date: Aug 2005
Location: Blenheim, New Zealand
5km is no worries provided you have good line of sight. Look for antennae with at least 15dBi of gain (more is generally better). Keep the antenna cable runs short and you will find most off the shelf gear will happily pull the distance.
If you use two of the same model of access point, set them up in bridge mode if possible to improve the efficiency of the network and eliminate a few flaws you can encounter using regular 802.11 infrastructure networks.
Try comparing various models of access point and look for models that offer higer transmit power and receive sensitivity (the latter is often overlooked, if they don't publish the specs then walk away).