Mobile telephone systems, radio broadcasters and other communication systems are the main sources of radiation in this area. In most cases measurements are taken under far field conditions and so use of an E (electric) field probe (e.g. the WPF8) will be sufficient. In the case of low frequency transmitters, we might find near field conditions, and so the H (magnetic) field will also have to be measured, e.g. with the WPH30 probe. The applicable reference standards include: IEC 62232 and EN 50492 (base stations), EN 50496, EN 50554 EN 50475 and EN 50476 (broadcast), EN 50400 and EN 50401 (fixed equipment for radio transmission).