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The antennas indicate that this is a GCA (microwave 3cm Ground Controlled Approach) setup, a blind landing system used during fog or otherwise poor visibiliy. Another fine product of the MIT Radiation Laboratory (RADLAB). The aircraft only needed a radio connection to the operator inside the van and no other special equipment. The operator 'talked' the aircraft down until he could see the runway. Sources indicate it was accurate to +/- 5ft horizontal and vertical. It had the first 'glide path' CRT displays ever developed and is the grandfather of all 'blind approach' systems in use today. Since it was developed during the war it was required to be 'mobile', i.e. transportable.