Anyone travelling through Germany will see them everywhere: wind turbines towering high above the landscape. This raises an obvious question: Why not use these existing tall structures for mobile network antennas as well?
Fewer new masts and better coverage sound like an efficient solution at first. In practice, however, there is more to consider. This article explores when wind turbines can be suitable antenna sites and which technical, regulatory and practical aspects need to be taken into account.
The basic idea: Height is an advantage
Mobile networks benefit from height. Generally speaking, the higher an antenna is installed, the greater its potential range and the better the line of sight. Wind turbines offer exactly these advantages:
- Hub heights of 100 metres or more
- Locations that are often exposed, such as hills or open areas
- Existing infrastructure, including access roads and power connections
At first glance, this makes them ideal candidates for mobile network sites, particularly in rural areas where conventional masts are often lacking.
Technical reality: Why it is not that simple
Despite these advantages, wind turbines are not plug-and-play locations for antennas. Several factors make their integration more challenging.
1. Movement of the rotor blades
The rotating blades can affect radio signals. Depending on their position, this can result in variations in signal quality or temporary shadowing effects, known as fading. Electromagnetic waves can also be unintentionally reflected and scattered.
These effects can be more noticeable at higher frequencies, for example with 5G in the GHz range.
2. Vibrations and structural movement
A wind turbine is not a static mast. The tower and nacelle move slightly during operation, while antennas require stable alignment. This can be particularly critical for microwave links or beamforming applications.
As a result, there are two typical options for positioning the antenna: mounting it on the tower below the rotor blades or integrating it into the nacelle. The latter option is considerably more complex and therefore less common in practice.
In either case, the antenna must be positioned so that interference from the rotor blades is minimised while ensuring optimal coverage of the target areas.
EMF and approval: Regulatory aspects to consider
From a regulatory perspective, wind turbines used as mobile network sites are subject to the same legal requirements as conventional radio sites. Key considerations include:
- Compliance with the limits specified in the 26th Federal Immission Control Ordinance (26. BImSchV)
- Assessment by the German Federal Network Agency (Bundesnetzagentur)
- Issuance of a site certificate before commissioning
Due to the particular geometry involved, including the height of the structure, rotating components and often exposed location, the EMF assessment can become more complex. This is where established methods come into play:
- The conventional sector method for simpler scenarios
- More precise calculation methods, such as Wattwächter, for more complex environments or technical configurations
For more background on the terminology surrounding EMF, see our article on EMV, EMF and EMVU.
Network planning: When wind turbines really make sense
Wind turbines are not automatically the best solution. Whether they are suitable depends heavily on the specific use case.
Particularly suitable for:
- Rural regions with significant coverage gaps
- Areas with limited existing infrastructure
- Locations with unobstructed views in multiple directions
Less suitable for:
- Dense urban areas, where excessively large cell radii can create capacity issues
- Locations where good network coverage already exists
- Scenarios in which precise alignment is essential, such as microwave links
One important point to keep in mind is that greater height does not automatically mean better network quality. Radio cells that are too large can reduce capacity and result in lower data rates.
Economics and operation: Cooperation is essential
Using a wind turbine as an antenna site requires close coordination between several parties: the wind turbine operator, the mobile network operator, and infrastructure and tower companies.
Typical challenges include:
- Access to the site for maintenance and safety purposes
- Integrating the equipment without interfering with wind turbine operation
- Clarifying liability and operating costs
Conclusion: Significant potential, but not a straightforward solution
Wind turbines can be an interesting addition to mobile network infrastructure, particularly in underserved regions. Their height and location offer clear advantages. At the same time, movement, structural characteristics and regulatory requirements place greater demands on planning and implementation.
So the real question is not “Why isn’t this done everywhere?” but rather: “Where does it make technical, economic and regulatory sense?”
With precise site analysis, suitable EMF calculation methods and appropriate planning, wind turbines can be strategically integrated into modern mobile networks.
At Field.fx, we provide support precisely at this interface: from the initial site assessment and selection of the appropriate calculation method through to documentation that meets regulatory approval requirements. This is how a promising idea can be turned into a reliable mobile network site.