The High Gain UHF Antenna is designed for special applications where a ground antenna may not be suitable or possible to use. We always recommend using our Ground Antenna where possible, since all antennas require line of sight between the antenna and transponder.  

Using the included clamp and mount, antennas can be attached to a variety of structures and easily rotated to match the required orientation of the antenna to the transponder. The antenna is linearly polarized but can work with either vertically or horizontally orientated transponders, to do so you must ensure that the antenna is correctly orientated to ensure optimal read rates. 

To ensure the antenna is correctly orientated the label on the back acts as a guide, the transponder pictured on the label should match the orientation of the transponders which you will be reading, there is also text to help ensure that this can be communicated.

To rotate the antenna press the silver quick release pin on the clamp, remove the antenna from the clamp and rotate accordingly then push the brass knuckle back into the clamp, aligning the clamp with the guide on the antenna. 

Setup Guidelines

• When setting up antennas facing each other they must be connected to the same decoder, do not use different decoders when antennas are facing each other. 
• For optimal precision we recommend a setup with 2 antennas on each side, mounted one above the other, with both pairs facing each other, and all four antennas connected to the same decoder using 12m cables for the antennas positioned further away from the decoder.
• When using main and backup systems the minimum gap between each setup should be equal to the width of the timing point. A chip in the middle of the 2 should not be detected by either system to ensure there is no conflict between antennas.
• When using main and backup systems the decoders should be positioned on opposite sides of the course (e.g., main decoder on the left of the course, and backup decoder on the right of the course), this ensures maximum detection strength on each side.
• For maximum read rate you can offset antennas on the same side slightly (e.g. 80° and 100° to the road), this maximizes the width of the read field.  
• When using multiple antennas with a large gap between them, you need to consider the decoder's Detection Setup settings to ensure optimal accuracy. If a transponder travels at high speed and passes both antennas within the reaction time then the time may be taken from the later antenna if the RSSI is stronger. This can be avoided by reducing the reaction time or using multiple decoders spaced apart sufficiently. 

Warning: As this is a 13dBi High Gain antenna you will need to set your decoder power accordingly to comply with local regulations.