The future of satellite-connected wearables took a significant step closer to reality in autumn 2025, with the successful demonstration of two-way S-band connectivity from a wearable antenna linked to a geostationary satellite. A team’s ascent of Mount Halti, straddling the border between Finland and Norway, served as the testing ground for this groundbreaking technology. Developed by Finnish company Stealthcase, with support from the European Space Agency (ESA) and collaboration with Radientum, the innovative antenna was integrated into a jacket designed by outdoor clothing brand HALTI.
This demonstration isn’t just a technological feat; it opens the door to reliable communication for emergency responders and individuals in remote areas lacking traditional cellular network coverage. The project addresses a long-standing challenge: incorporating antennas into fabrics and surfaces, traditionally hampered by the delicate nature of their components and the difficulty of cost-effective, rapid production. Stealthcase overcame these hurdles by developing a scalable method to imprint the antenna coating onto textiles without compromising conductivity.
To trial the technology, a team undertook a six-hour trek to the summit and back of Halti, Finland’s highest peak. The team split into two groups – those ascending the mountain and those remaining at lower altitudes – to test the jacket’s connectivity. They successfully demonstrated two-way communication via a direct link to a geostationary satellite over 35,000 km away, sending and receiving text messages throughout the journey. Remarkably, the satellite link remained strong even in areas where terrain was expected to cause signal blockage.
“Every now and then we stopped to make connectivity tests, and the surprising thing was that the satellite link was working at the lake in Norway [Guolasjávri], even though we thought it was shadowed by Halti fell,” noted Juha Lilja, founder of Stealthcase and a member of the demonstration team. He recounted that even at the starting point, deep within the mountain’s shadow, the connection remained fluent, a result that even surprised the team’s Finnish engineers. “It was a moment where even the most reserved Finnish engineer had to chuckle and say, ‘Not bad.’”
From Glass Antennas to Wearable Connectivity
Stealthcase has a proven track record of pioneering antenna development, including creating glass antennas designed to maintain indoor connectivity despite the signal-blocking properties of modern energy-efficient glass. The company’s founder, Juha Lilja, has dedicated years to advancing wearable, satellite-linked antennas, previously collaborating with emergency services to develop resilient gear for ocean rescues. This latest demonstration builds on that foundation, bringing the promise of truly connected, resilient wearables closer to everyday use.
This technology exemplifies innovative applications of space technology driven by Finnish companies, unlocking the potential of space for everyday life. The project, titled ‘Wirelessly Connected Textile Antennas for Smart Clothing,’ received funding from ESA’s Industrial Competitiveness programme line, part of the agency’s Advanced Research in Telecommunications Systems (ARTES) programme. The ESA’s support underscores the growing recognition of the potential for textile-integrated antennas.
The Potential for Emergency Response and Beyond
According to Hoda Nematollahi, Antenna Engineer at ESA, “Turning clothes, life rafts, and more into antennas makes sure People can keep people connected when they need it the most.” She added that Stealthcase’s perform is “a great example of the unexpected solutions and innovations that come out of ESA supported research to enable novel businesses and applications.”
The implications of this technology extend beyond recreational use. Reliable satellite connectivity embedded in clothing could be a lifeline for emergency responders operating in remote areas, enabling consistent communication during critical situations. It could also provide a vital link for individuals traveling or working in areas with limited or no cellular infrastructure. The successful demonstration highlights the potential for wearable satellite communication to enhance safety and connectivity in a variety of scenarios.
While the technology is still in its early stages, the successful trial on Mount Halti represents a significant milestone. Further development and refinement will be crucial to scaling production and reducing costs, but the groundwork has been laid for a future where staying connected, even in the most remote locations, is as simple as putting on a jacket.
What comes next will likely involve further testing in diverse environments and collaboration with industry partners to integrate the technology into a wider range of wearable products. The potential for this technology to revolutionize communication in remote areas and emergency situations is significant, and continued innovation will be key to realizing its full potential.
Share your thoughts on this exciting development in the comments below!
