This is a question we are asked frequently. When wireless ranges are determined they are always rated in a “line of sight” situation, meaning over an open field. This is why the advertised wireless ranges are almost always significantly further than what you a customer may experience in a real world application with obstructions (this is the same for everything, driveway alarms, wireless phones, wireless doorbells etc.). However, the term “line of sight” does NOT mean that an obstruction such as trees, walls, etc. will block the wireless signals. It will simply impede them, so for example a system which is rated at 2000 feet “line of sight” will probably achieve 1500 feet in a “real world” scenario.