A portable, handheld RF receiver that detects known, unknown, illegal, disruptive or interfering transmissions. MESA® 2.0 has the portability and operational features not found on other spectrum analyzers. It provides tools, specifications, and design features for locating unknown signals throughout a wide frequency range up to 6 GHz (*12 GHz with the Downconverter antenna, and 18GHz with the 18GHz Downconverter antenna