Yamaha Revolabs Executive Elite 03-ELITEEXEC8-AU Installation And Operation Manual page 21

Wireless microphone system
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Antenna RF Polar pattern
The RF polar pattern of the antenna has a null on the plane of the antenna.
Strongest signal is towards the front of the antenna.
Towards the back of the antenna, the signal is several dB weaker.
Front
Polar pattern of Antenna, side view
Antenna placement
Best results are achieved when the antenna faces into the area where the
microphones are used.
Optimal placements for the Antenna are either below the ceiling in the middle
of the room facing down, or high on a wall facing into the room.
The antenna should not be placed flat, e.g. on a table or in a rack, similar to
the height the microphones are typically placed.
21

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