http://64.233.179.104/search?q=cache:qCdmPzqqS30J:ourworld.compuserve.com/homepages/pjmarsh/sband.htm+s+band+satellite&hl=en&gl=us&ct=clnk&cd=1&client=firefox-a
Try this link as a starting point. S band is a helix antenna that is omni directional for the most part. It is used for live video...