Este formată din doua antene în λ/2 aşezate una în prelungirea celeilalte (fig. 111), avînd posibilitatea de modificare a diagramei de radiaţie în banda de lucru.
Prin alimentarea simfazică a celor doua antene, diagrama de radiaţie prezintă un lob perpendicular pe planul antenei şi un cîştig de 2 dB faţă de un dipol clasic în λ/2(fig. 111 b). Prin alimentarea în contrafază diagrama de radiaţie devine aproape circulară, cu patru lobi principali şi un cîştig de 1 dB faţă de un dipol clasic (fig. 111 c). În ambele cazuri unghiul vertical de radiaţie rămîne acelaşi.
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