IoT Connectivity in 2025: How Smart Metering is Reshaping Antenna Demand

The Internet of Things has been talked about for the better part of two decades. But it is smart metering — the unglamorous, essential backbone of the UK's energy and utilities sector — that is arguably doing more than any other application to drive real-world antenna specification decisions right now.

The UK government's smart metering rollout, combined with the requirements of Net Zero infrastructure and the proliferation of machine-to-machine (M2M) communications across utility networks, has created a sustained and growing demand for IoT antenna solutions that are reliable, low-profile, and capable of operating in challenging RF environments without human intervention for years at a time.

The Scale of the Challenge

The UK currently has over 32 million smart meters installed, with the rollout continuing towards a target of near-universal coverage across all domestic and small business premises. Each of those meters communicates wirelessly — using a combination of 2G, 3G, 4G and increasingly 5G NB-IoT connectivity — through antennas installed in locations that would challenge even well-specified external antennas: under-stair cupboards, basement utility rooms, metal-clad commercial plant rooms.

As Ofcom has noted in its spectrum strategy documentation, "the energy industry has emphasised the criticality of spectrum availability to support smart and advanced metering communications infrastructures and wider network infrastructure for the UK's Net Zero transition." Spectrum alone isn't enough; the antennas using that spectrum need to perform.

What the IoT Antenna Market is Responding With

Internal wideband antennas designed for integration within meter and monitoring equipment enclosures, covering the full range of cellular IoT bands from 700 MHz to 2100 MHz, plus NB-IoT and LTE-M specific bands.

External antenna options for installations where internal antenna performance is insufficient — typically a short, low-profile whip or patch antenna. For difficult environments, even modest external antenna gain (3–6 dBi) can make the difference between reliable connectivity and regular dropouts.

GNSS-combined IoT antennas that serve dual duty for metering applications that also require precise time synchronisation or location data — increasingly common in grid-edge energy management systems.

Beyond Energy: The Broader IoT Antenna Demand Picture

Smart metering is the largest single vertical, but it sits within a much broader IoT connectivity expansion. Traffic management, smart cities, and industrial IoT are all adding to the density of connected devices requiring antenna infrastructure. According to RCR Wireless, manufacturing and warehousing are the top vertical sectors for private 5G investment in 2025, driven by Industry 4.0 requirements for real-time machine monitoring, robotics and supply chain visibility.

Antenna Specification for IoT: The Practical Checklist

Power consumption. For battery-powered IoT devices, antenna efficiency directly affects battery life. A well-matched antenna with high radiation efficiency reduces the transmit power required — extending battery life meaningfully over a multi-year deployment.

Form factor. IoT enclosures are typically compact. Flexible PCB antennas, ceramic patch antennas and miniaturised whips all have their place depending on available space and frequency requirements.

Longevity. IoT deployments are long-term. An antenna specified today for a smart meter installation needs to perform for 10–15 years without maintenance. This places a premium on robust construction, appropriate environmental ratings and connector quality.

Multi-band capability. With cellular networks continuing to evolve, IoT antennas that cover a broad frequency range including NB-IoT, LTE-M, 4G and 5G bands offer the best protection against network migration during the device's operational life.

Browse Renair's IoT and M2M antenna range at renair.co.uk/products.

Frequently Asked Questions

What is NB-IoT and how does it differ from standard 4G for smart metering?

NB-IoT (Narrowband IoT) is a low-power wide-area cellular technology designed specifically for IoT devices that send small amounts of data infrequently. It offers better building penetration than standard 4G, longer battery life, and lower device cost — making it well-suited to smart meters and similar applications.

Can I improve smart meter signal strength by adding an external antenna?

In many cases, yes. If a meter has an external antenna port, connecting a compact external antenna — even a simple 3 dBi whip — can meaningfully improve signal reliability in locations with weak coverage, such as basements and metal-clad plant rooms.

What antenna is used inside a smart meter?

Most UK smart meters use an integrated internal antenna — typically a PCB trace antenna or a small ceramic patch — designed to cover the frequency bands used by the cellular IoT networks the meter connects to.