I plan to launch my sensor / radar / scanner on Monday.
It scans a rectangular area, not a circle.
With a distance based radar-like scanner you are forced to make a choice: Scan too much and pick up your neighboor, or scan too little and miss the corners if your house (shop etc.) is rectangular. This tool elimits false positives and negatives, scanning precisely within a rectangular area (1x1 - 96x96 sqm.).