Wireless M-Bus data collection has become a central component in modern properties. This technology enables cost-effective data collection from water, heating, electricity, and temperature meters without the need for extensive cabling. However, achieving a stable and reliable solution requires proper planning and installation.

One of the most common questions is: How far does a Wireless M-Bus signal actually reach?

The short answer is, it depends. The range is affected by everything from building materials and floor levels to antenna placement, transmission power, and surrounding sources of interference. Therefore, it's difficult to specify exact distances that apply to all installations.

In this guide, we share practical recommendations and experiences from real-world projects where MIVO Connect is used to collect data from everything from individual apartment buildings to larger residential areas.

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Antenna Placement – The Most Important Success Factor

When it comes to Wireless M-Bus, antenna placement is often crucial for the outcome.

For the best possible coverage, the antenna should:

• Be placed as high as possible
• Be positioned as centrally as possible within the area to be covered
• Be mounted outdoors if possible
• Have a clear line of sight to as many meters as possible

In many cases, it's more effective to run a longer antenna cable than to place the antenna in a less optimal location.

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Outdoor Antennas Often Provide Significantly Better Coverage

Experience shows that an outdoor antenna directed towards the property often provides significantly better reception conditions than an antenna placed inside the building. Walls, concrete structures, and technical rooms can significantly reduce signal strength.

By moving the antenna to roof level or a facade-mounted position, coverage can be significantly improved.

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Transmission Intervals and the Importance of the Radio Signal

The choice of meters and sensors also affects system performance.

For new installations, a transmission power of 25 mW and relatively frequent transmission intervals are generally recommended.

A practical rule of thumb is that the meter should transmit at least three times more frequently than the desired resolution for data collection.

Example:

• Desired data collection every 15 minutes → transmission every 5 minutes
• Desired data collection every hour → transmission every 20 minutes

More transmissions increase the likelihood that the gateway will capture all telegrams, even in more challenging radio environments.

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Recommended range for planning

As a starting point, the following guidelines usually work well for quoting and project planning:

Note that these values vary depending on the building's construction, antenna placement, and the type of meter used.

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When is a repeater needed?

If the signal needs to pass through multiple buildings, many floors, or longer distances, a Wireless M-Bus repeater can be an effective solution.

A repeater receives the radio signal from the meters and forwards it to the gateway, which can:

• Extend the range
• Improve reception in difficult environments
• Increase system reliability

For larger property areas, it's advisable to plan for repeaters during the project planning phase.

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Reference Project: Centrally Placed Antenna Covers an Entire Block

In a residential area with several stairwells, a MIVO ANT04 outdoor antenna was installed centrally in the courtyard.

The antenna was connected to a MIVO Wireless M-Bus Extender along with the gateway and positioned so that all buildings were within the optimal coverage area.

The solution included approximately 170 wireless meters and sensors for temperature and energy measurement.

Thanks to the strategic placement, the entire area could be covered without the need for repeaters or additional gateways, which both reduced installation costs and simplified long-term operation.

[Image: Centrally placed ANT04 antenna in residential block]

Reference Project: 193-meter range without a repeater

In another project, a MIVO ANT04B outdoor antenna was mounted approximately ten meters above ground level on an existing TV mast.

The high placement provided excellent coverage of the area and enabled communication with approximately 200 wireless water and heat meters.

The furthest house was located approximately 193 meters from the antenna, but despite the long distance, the installation could be completed without a repeater.

The project clearly demonstrates the significant impact of antenna placement on range. It also illustrates the importance of designing the system for future needs. For a larger number of meters, a repeater might still be justified to create extra redundancy and long-term operational reliability.

[Image: ANT04B mounted on a TV mast with coverage across the entire area]

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Summary

When it comes to Wireless M-Bus, antenna placement is almost always the most crucial factor for achieving stable communication.

By:

• Placing the antenna high and centrally
• Using outdoor antennas whenever possible
• Choosing appropriate transmission intervals
• Planning for repeaters when necessary

you can create robust and scalable solutions that will function for many years to come.

For property owners and installers, this means higher data quality, fewer support cases, and a more future-proof infrastructure for smart meter data collection.

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