http://blog.makezine.com/archive/2011/12/seeing-em-waves-with-a-single-led.html?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+makezineonline+%28MAKE%29&utm_content=FaceBook This is an excellent demonstration of how an RF signal 'radiates' and how the 'WAVES' propagate! Marv, K2VHW