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Antenna placement

Reach Module has been replaced with Reach M+. Documentation for Reach M+ can be found here.

A well-placed antenna is essential for achieving good RTK positioning results.

You can place your smartphone near the window in your house and it will obtain GNSS coordinates after some time, but for RTK such environment won't be sufficient. For RTK to work there are special requirements for antenna placement.

Clear sky view without obstacles

An antenna needs to have a clear sky view 30 degrees above the horizon. There should be no obstacles that could block the view like buildings, trees, cars, humans, laptops, etc.

Examples of good environments for antenna placement:

  • field

  • top of the hill

  • the rooftop

Examples of bad environments for antenna placement:

  • indoors

  • urban areas

  • forest

  • close to the ground

No electronics nearby

Electronic devices may produce RF noise that could affect the reception of the GNSS signal. Keep all electronics (including the Reach Module itself) as far as possible from the antenna.

Ground plane

An antenna has to be placed on a ground plane which reduces multipath, provides shielding and improves signal reception. A ground plane is a conductive plate, it may be a piece of metal, a roof of a car, a metal roof of a building, etc.

Tallysman TW4721 requires ground plane no less than 70x70mm (3x3 inches).