This invention relates to an absorbent body for highf'eqency electromagnetic" `radiatcn'f 'a'nd has 'f oiitsy principal"ob'je`ct"tciprovide a earis -prevent` or reduce reflection of electromagn c radiation froni`srfaces""" Another 'object'f' the invention is to provide a lcoinplsite`"fsiirfaee tvhic'liV may'bje appliedto annst'any object' to render it'non-ren'ectve-for electromagnetic radiation" of a""predtrxriined high frequency.