said coil of {TAIL ~ wire} providing a tubular shaped metallic grounding surface which alters the electromagnetic field of said radio frequency energy radiated by said ported coaxial cable to direct and concentrate said energy about said coil of {HEAD ~ wire} 
said coil of { TAIL ~ wire } providing a tubular shaped metallic grounding surface which alters the electromagnetic field of said radio frequency energy radiated by said ported coaxial cable to direct and concentrate said energy about said coil of { HEAD ~ wire }
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD