UK incumbent BT’s latest infrastructure project is focused on “towers in the sky”. These are more commonly known as high-altitude platform stations (HAPS), and have been the focus of several projects in recent years – led by operators, hyperscalers and space companies. These aircraft can support backhaul or even longhaul access. BT Group is working with a specialist company, Stratospheric Platforms (SPL), to test new antenna technology installed on a hydrogen-powered HAPS aircraft, aiming to demonstrate 4G and 5G connectivity to remote areas. SPL is in the process of raising €148m in Series-B funding to build a prototype of its aircraft, called Stratocast, this year, and is putting together a consortium to build the vehicle, ready for a commercial launch slated for…