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Finnish technology beats the F-35's stealth – detects it from almost 400 km away! Imagine this: A stealth fighter that is built to be invisible to radar… but Finnish brains from Saab in Tampere now have a small box that listens to it from almost 400 kilometers away. The news? The new Sirius Compact L24R device is being launched this week at the Electronic Warfare Expo in Helsinki. It is completely passive – it doesn't send anything, it just listens to all the electromagnetic signals on the battlefield. Unlike the old backpack variants (which a soldier could carry), the L24R is made to be screwed onto masts, windmills or tall buildings. A single cable, 65 watts, no cooling required. Three of them provide 360-degree tracking. And it pinpoints the direction with less than one degree of accuracy. Product manager Pekka Halme: “We can detect signals better than with the tactical systems because we only look at a certain sector.” It can pick up radar signals from fighter jets (like the F-35 when the radar is on), commercial aviation weather radars and even ship navigation radars. Sales manager Mathew Wilmot boasted about how it can be built into a large, decentralized sensor network – and mentioned Finland’s southern coast and eastern border as an example. In other words: Russia can forget about sneaking in by plane or ship without the Finns knowing exactly where they are. And the best part? The system has already been sold to 10 countries. The irony is outstanding: You build an aircraft that is supposed to be invisible… and then a Finnish box comes along and says “hey, we can hear you anyway”. Stealth? More like “scream all the way”. What do you think – will this make both Russia and China sweat a little extra, or is it just another cool gadget in the electronic warfare? Source: Saab Finland / Tampere Technology Centre – press briefing ahead of launch at AOC Europe, Helsinki (23–24 May 2026)