A three wire balun is disposed coaxially of the vertical axis and within 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 {HEAD ~ the IFF antenna} and the GPS antenna for {TAIL ~ isolation} therebetween 
A three wire balun is disposed coaxially of the vertical axis and within 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 { HEAD ~ the IFF antenna } and the GPS antenna for { TAIL ~ isolation } therebetween
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