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The reconfigurable monopole antenna. The switch control is routed inside the (hollow) base section to a latching relay switch between sections.  

The reconfigurable monopole antenna. The switch control is routed inside the (hollow) base section to a latching relay switch between sections.  

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... design uses a electronically-reconfigurable monopole, as shown in Figure 2 and described in [3]. The two states of the monopole are referred to as "high-band" -intended primarily for frequencies in VHF-High band and above -and "low-band" -intended for VHF-Low. ...

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