Is there an absorber that isn't crazy expensive, that will give me 4 or 5 d= B attenuation in a thickness of around a foot or less, at 0.5 MHz? Not a reflector like metal, but an absorber that will give the energy somew= here to die. --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .