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For more information on antennas for Lantronix WiFi device servers, see : Types Of Antennas For Lantronix Wireless products
Some references list a maximum 802.11 range of up to 300 feet (91 meters). More realistically the average reliable distance inside a building is 80-100 feet (24-30 meters). This will vary depending on the characteristics of the site.
In general the only way to know for sure how far apart 802.11 devices can communicate is to test the wireless devices you are planning to use at different locations at your site. This will allow you to determine if one or more 802.11 repeaters are required for full coverage.
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