Commercial: www.wimo.com Wimo antennas can be purchased through http://www.ssbusa.com Homebrew: Very good sites: http://ve2zaz.net/ also http://members.aol.com/k5oe/index.htm select Home Brew Hardware Picture Alblum at lower left of page. If I can assist in any way, please email. Mike K9QHO AMSAT 33589