Placement
Height is the highest leverage decision.
Mounting a Drone-Mapper remote detector on rooftops, radio towers, or as high as you can get them will always outperform the same detector mounted lower. Range varies greatly, depending on height above ground, terrain, and surrounding objects. A good rule of thumb is that if you could fly a drone from the location you mount the detector, the detector will most likely be able to hear a drone from that location.