The present invention improves user-friendliness and protect content with increased reliability when judging whether network devices belong to the same home network. A sidewall film is formed on a surface of the metal member layer. An XOR gate adds the input data signal and the first delay signal provided from the first delay, and provides an inverted signal of the added signal. Each antenna element group can have one to M antenna elements. The suspension system provides a system for suspending HVAC equipment in residential and light commercial applications that is safer, quicker, cheaper, more reliable and more accurate than systems currently in use.