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[news from bbc.co.uk]
Research carried out by the air traffic control provider Nats and its partners suggests that existing TV signals could be used to track aircraft, providing a cheaper alternative to radar.
TV signals use different parts of the radio spectrum to radar, but both bounce off solid objects.
Using special receivers, researchers said they were able to track up to 30 planes simultaneously flying at altitudes of up to 10,000ft (3km).