The second reply to this theory is wrong. Electric magnetic fields can be attenuated by other electromagnetic fields and their frequency changed. try the experiment of sending a radio wave thru an electromagnetic field of a toroid and you will see a change in power and frequency of the wave you sent thru the toroid. Its basic electronics. But in a device as the author of this theory has written the affect will clean space and allow you to pass thru. Also a strong magnetic fields will absorb other magnetic fields and there energy when they contact one another.