In both experiments, the experimental enclosure (width 1 × length 1 × height 0.75 m) was without any metal components that might reflect incident microwaves. This enclosure was in the center of a 10 × 10 m square area surrounded by a 2 m tall black cloth blind. Two Everio video cameras (GZMG750BUS, JCV Kenwood, Yokahama, Japan) filmed the enclosure, one overhead and one from the side. Another Everio camera filmed the dish of the radar. These cameras fed into a multi-channel DVR so that all inputs were recorded in the same video file.