Marine radar – an X band radar on ships used to detect nearby ships and obstructions like bridges. A rotating antenna sweeps a vertical lover-formed beam of microwaves round the drinking water surface surrounding the craft out towards the horizon. 2nd, you have to know what frequency band you want https://handheldsignaljammer19529.techionblog.com/12478651/5-simple-statements-about-handheld-signal-jammer-explained