Here is the situation: a grain handling company in Minnesota needed level measurement for a cluster of eight grain silos. This seemed like a usual, run-of-the-mill request. However, the cluster consisted of six 120 foot tall concrete silos that were arranged in such a way that they formed additional storage, which resulted in two interstice or star-bin silos. Narrow tall silos present problems of their own, but the more complex geometry of interstice or star-bin silos is truly a challenge for most radar transmitters operating around 25 GHz. Because the silos are narrow, the fill stream also can take plenty of the free space available in the silo and doesn’t leave a clear path for the propagating signal to make a consistent level measurement. Another common challenge these days is that technical personnel can’t spend hours optimizing level instruments. Thus, easy to install and configure instruments are a must.