WiFi Booster High Gain Antennas ?

[noblues]

Has anyone any experience of using high gain antennas 'downroute' for picking up signals?

Do they help pick up normally unseen networks?

Say .. http://www.edimax.com.tw/html/englis...EW-7317UHg.htm

Or the Hawking products ..

http://www.hawkingtech.co.uk/