Countermeasures
To counter Freya, the British used equipment called "Moonshine". Carried by Boulton Paul Defiants of the Special Duties Flight (later 515 Squadron), a single set retransmitted a portion of the Freya signal amplifying the apparent return. Eight aircraft with Moonshine could mimic a force of 100 bombers. A second countermeasures system, "Mandrel" was a noise jammer which overwhelmed the signals from Freya. Individual aircraft were sent to orbit fixed positions 50 miles (80 km) off the enemy coast. By using nine aircraft, a 200-mile (320 km) gap could be knocked into the German's radar coverage, while further jammers were carried in the bomber stream to counter the inland Freya network.
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A Pole Freya radar.
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A Limber Freya radar.
Read more about this topic: Freya Radar