The Sophos AP50 has a 2dbi antenna, connector rp-sma. You can pickup a used AP-50 on EBay. On EBay you can also get a 3rd party antenna with a higher dbi (dual band) which in theory will give you a larger range. The only unknown factor is the power draw at the connector. Look for EBay seller Wifi Expert Ask the guy about which antenna he recommends.
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