I use Ecoflex 10. I originally bought a Wimo antenna and preamp - they provide a cable/plug/lead assembly for the connection between the RadarBox and Bias Tee (SMA to BNC). I've also got a Kuhne pre-amp, and that has N connectors either end. To get around that connection problem, I have an SMA/N adaptor, with an additional right-angled N connector to ease the strain.
DC