RFE's PCB Antenna orientation for best quality.

[korda]

Please suggest RFE's orientation in order to package the unit on custom bulid board for better quality of communication.
Does it work better in horizontal plane, and North-South or East-West?
How much quality is affected by placing antenna (RFE board) vertically?

[David Ewing]

It should be pointed out that other factors such as physical (especially metal) obstructions generally have a greater affect than antenna orientation in most applications. Be sure to follow the guidelines in the SNAP Hardware Technical Manual for keep-out area beneath the F antenna, and avoid metal pieces in enclosure where possible. But there is no substitute for actual testing of the proposed installation. Often we are surprised by very good performance under less than ideal packaging conditions.

As far as orientation goes, ideally all antennas will be oriented in the same direction. This avoids attenuation due to cross-polarization. The theoretical optimum orientation of the F antenna is with the "stem" pointed upward, as shown below.

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[korda]

Thank you, this makes sense.
What does not make sense - the evaluation boards with all RFE antennas mounted horizontally.