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