Defence giant Raytheon makes a device called Landshield, which is about the size of an ice hockey puck in its smallest form. The company says this "anti-jam antenna system" can be installed on different kinds of vehicles – from cars to aircraft – and that it uses multiple channels to overcome jamming. "We're seeing quite an increase in demand and capacity for our anti-jamming products at the moment," says Alex Rose-Parfitt, engineering director of Raytheon UK.
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