In the US, radio amateurs have access to literally hundreds of MHz of microwave frequencies, across several bands. One of the common uses of micro-wavelengths is radar systems that can detect objects at a distance. If you had a reason to build a radar for your own private use, which of the amateur bands would you choose, and why? For reference, here's a link to a chart which at least lists the microwave bands allocated to amateurs in the US: http://www.arrl.org/graphical-frequency-allocations There are different kinds and uses for radars, so feel free to give more than one answer. E.g., a vehicle radar to detect proximity to other vehicles might use one band, while a radar to detect aircraft flying in the skies overhead might use another. Building a radar is probably not the first thing hams think about using their privileges for, but it does seem like it should be a valid use of our allocations. After all, radar technology is a very active field, and building a "ham radar" would seem to be a neat learning experience. I know many of you have professional experience with radar equipment of all kinds, so I'm hoping some of you might enjoy sharing some insight from your experiences.