Hi Helmut, Go to http://www.eh-antenna.com for more info. There is a kit available. The patent is at: <http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&u=/netaht ml/search-adv.htm&r=1&f=G&l=50&d=PTXT&p=1&p=1&S1=6486846&OS=6486846&RS=64868 46> The yahoo mail list is at: <http://groups.yahoo.com/group/eh-antenna/> Regards, Tony