The last radar contact of Malaysian Airlines flight MH370 was at 0215hrs local time, the aircraft was flying at 29500ft and was 200nm northwest of Penang island. The radar under Malaysia’s air defense umbrella that could see the Boeing 777 was a SELEX RAT-31 DL long range radar that sits on top of Penang Hill, 800m above sea level.
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According to literature provided by the manufacturer, the radar has an instrumented range of 400km. As shown in the graphic below, this corroborates with last known position of the airliner, approximately 70nm south-southwest of Phuket.