The PDF brochure they sent me about siting mentions:
"For the absolute best performance, it is imperative that the antennas, specifically the stroke antenna, be located away from any RFI (Radio Frequency Interference) and other noise sources. The following are examples of noise sources that might interfere or produce false lightning detection: Power Lines (High Tension Lines), Motors (elevator, HVAC, exhaust/ventilation fans, motorized satellite tracking antennas, etc.), Power Sub Stations, AM Radio Towers, Spark Producing Equipment (welding shops, electrical fences, etc.), Guy wires, High Wattage Power Inverters"
An electric impact tool might be an issue, but not a pneumatic one. The compressor however might be.
They're also talking about the antennas, not the gadget box.