MAR was an L band active electronically scanned phased-array radar . The original MAR-I had been built into a strongly reinforced dome , but the later designs consisted of two half-pyramid shapes , with the transmitters in a smaller pyramid in front of the receivers . The reduction in size and complexity was the result of studies on nuclear hardening , especially those carried out as part of Operation Prairie Flat and Operation Snowball in Alberta , where a sphere of TNT was detonated to simulate a nuclear explosion
Operation Snowball
Operation Snowball (test)
Nike-X