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