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So, any chances of finding such a device out in the wild? Suggestions for detecting the most likely used type of radio transmissions? How can they transmit over

So, any chances of finding such a device out in the wild? Suggestions for detecting the most likely used type of radio transmissions? How can they transmit over 5Km with USB power and no antenna?

XorNot 13y ago
Under the right conditions you can send radio messages around the world on as little as 5 watts. You gotta remember that there's two sides to any radio system: the transmitter and the receiver, and both determine what you can do. After all, with the right antenna on one side, you can use wi-fi over a distance of miles.