The RFI CDQ Heavy Duty spring base is for extreme conditions and is the spring base that comes standard with the RFI CDQ8000 8.5dBi UHF/Cellular antennas.

This unit has an FME connector that makes passing through tight spots easier than other connectors. You may need an SMA adaptor for this unit if connecting to Cel-Fi or a PL259 / MPL adaptor for UHF antennas.