Proxima ASA 7911 - Manual (Page 72)

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Proper antenna placement can help improve range. Here are
some guidelines:
❑ The antenna should be placed in a vertical position.
❑ Do not place a sheet of metal (like a filing cabinet)
between two antennas.
❑ Two antennas that are communicating should be in the
same plane. For example, do not lie one antenna on its
side and have its partner standing upright.