Radar testing sometimes requires transmitting high-power pulses upward to avoid ground level EMI or worse.
I notice that they have a space fence radar there, on google maps. It does not say if it is a transmit or receive station. The old space fence had one primary transmitter and six receive stations. along roughly the 32nd parallel from Georgia to Arizona. I don’t know how the modern version works, but there was talk of siting a station in northwestern Australia. There is also a GBR-P, a huge, powerful, X-Band radar on Kwaj. They have RF radiation monitors to detect any harmful radiation from it. There are four powerful radars on the island of Roi-Namur on the atoll, North of Kwaj.