The videos below illustrate the use of the VK3AQZ RF power meter to measure electromagnetic field strength around an Amateur radio station. There are 3 parts to the demo.
Owen has given access to his LOOP antenna calculator as demonstrated in my video of EMR measurements using the RFPM1 power meter. This calculator enables you to vary the parameters to suit your particular requirements. http://owenduffy.net/calc/SmallLoopAF.htm