Instruction manual

Installation Page 17
Installing Directional Antenna
The directional antenna may be mounted in either the vertical or horizontal
plane. If it is communicating with an omni-directional antenna it must be
mounted in the vertical plane. If communicating with another directional
antenna, the two may be either vertical or horizontal; both must be in the same
plane, however.
Note:If an interfering radio source is nearby it will be helpful to orient the antennas opposite (orthog-
onal) to the plane of the interference. AM radio transmissions are typically vertically polarized,
so horizontal antennas will better reject AM radio interference. Television and FM radio trans-
missions are usually horizontally polarized, so vertical antennas will better reject TV and FM
radio interference.