look carefully at ur windscreen u might see a thin wire imbeddd into the glass goin around the outside this is ur aerial, if it gets too hard u could always buy a cowl mount aerial, as for the wire ur factory aerail wire is probably a 2-core conductor where as the more standard aerial systems use co ax like ur tv antennae at home, u cant blow anething up with ur aerial just dont put a current across it , basically the aerial is a conductor made to be a certain impedance to pick up radio waves, these travelling thru the air induce a current in the wire with ur headunit then amplifys