The ClearStream Signal Meter is an effective and inexpensive way to aim antennas and measure performance and will detect the presence of transmissions on the frequencies most TV stations broadcast. Compact, lightweight and easy to use, the Signal Meter is useful in antenna aiming, especially rooftop installations where a large, commercial grade signal meter may not be practical. Integrated filters reduce the possibility of "false positives". Signals above 700 MHz are filtered to minimize detection of cellular and post 2009 wireless broadband transmissions. Broadcasts below 470mhz are filtered to minimize detection of amateur radio, public safety, FM radio etc. The Signal Meter includes a 9V battery. Note: the SM200 meter will not identify specific HDTV broadcasts by channel number. A commercial grade field meter is advised for those capabilities.