a ported coaxial cable disposed on {HEAD ~ the external surface} of said coil of wire and extending along {TAIL ~ the length} thereof 
a ported coaxial cable disposed on { HEAD ~ the external surface } of said coil of wire and extending along { TAIL ~ the length } thereof
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH