{HEAD ~ A three wire balun} is disposed coaxially of the vertical axis and within {TAIL ~ the IFF antenna} to feed the GPS antenna and a conductive shield is disposed coaxially of the vertical axis surrounding the three wire balun and interconnecting the IFF antenna and the GPS antenna for isolation therebetween 
is disposed within
{ HEAD ~ A three wire balun } is disposed coaxially of the vertical axis and within { TAIL ~ the IFF antenna } to feed the GPS antenna and a conductive shield is disposed coaxially of the vertical axis surrounding the three wire balun and interconnecting the IFF antenna and the GPS antenna for isolation therebetween
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