Get from Amazon.com : http://www.amazon.com/gp/product/B007M839S8?tag=hawaiianlegac-20
TOMTOP High Power Signal King 20DBI Outdoor USB Wireless Adaptor Antenna 150Mbps
High quality stable durable
20dBi directional high gain antenna high sensitivity long range
Range over 3KM outdoor with connection
Ralink 3070 chipset
IEEE 80211 BGN up to 150Mbps