The range for a monostatic microwave sensor can reach up to how many feet?

• A. 100 feet
• B. 400 feet
• C. 200 feet
• D. 800 feet

Answer: (B)

Monostatic microwave sensors transmit and receive from the same antenna, so their practical maximum range is driven by transmitter power, antenna gain, and clear line-of-sight. For standard commercial monostatic units, about 400 feet is the typical upper limit, giving enough reach to cover larger indoor spaces or outdoor perimeters while remaining reliable and manageable in terms of false alarms. Shorter ranges like 100 or 200 feet are common in smaller installations, but they don’t reflect the full capability of a single monostatic sensor. An 800-foot range would usually exceed what a single detector can reliably detect under ordinary conditions, so 400 feet best fits the expected performance.