Broadband white noise generator suitable for the comparison of test sites/shielded enclosures. It is a self-contained unit with replaceable dry cells. The device creates “white” noise over the spectrum. There are two top-loaded monopoles for emitting efficiently over the spectrum. The main unit has battery indicator flashing LED to show the device is transmitting. It will auto switch-off after a given period of time. Disc antenna diameters are 100mm.