A device and method for detecting motion with antimasking capability. In one example, the device includes an antenna, a dual-channel reception circuit, and an electronic processor. The dual-channel reception circuit includes a first channel and a second channel. The electronic processor is electrically connected to the dual-channel reception circuit and is configured to receive a first signal from the first channel indicative of motion at a first range, and receive a second signal from the second channel indicative of motion at a second range. At least a portion of the second range is shorter than the first range. Based on the first signal and the second signal, the electronic processor is configured to generate a notification.