Hi, This website (AntennaWeb.org): http://www.antennaweb.org/antennaweb/step1.html Shows the free OTA DTV signals in the San Francisco area as coming from all directions. It also says I need a medium directional antenna with pre-amp. I'm considering buying the Samsung STB SIR-T150. My question: Would I be able to receive a quality signal from all OTA DTV stations, or would I have to reposition the antenna based on which station I wanted to watch (to match the direction its signal was coming from). Thanks!