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Most of the FM stations broadcast circular polarization, but it seems
that more of the hoz part gets attenuated by trees more than vertical. So if there is a shallow angle to the transmitter, through some vegetation Vert seems more dominant. But I think this changes with over-the-horizon, and it gets more Hoz, but I have not measured this. On the original question, you can add antenna patterns if they are phased right. You can put a piece of metal in the direct path to block signal, may go down 10 dB or so. Metal could be screen wire mesh between dipole and unwanted transmitter 10 by 10, centered to get phase null in the back. "JGBOYLES" wrote in message ... I thought the FCC required equal EIRP of both vertical AND horizontal polarization for an FM broadcast station? Did the horizontal requirement get deleted? I don't know, just reporting on the results of my tinkering, I get by far the best signal with vertical polarization. I assumed that was becuse they wanted to target automobiles. Maybe the EIPR of the stations in both the vertical and horizontal planes in my area are not in compliance? 73 Gary N4AST |
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