SCARP is a new aviation radio technology developed by James Wiebe, CEO of RADIANT Technology. Wiebe calls it a "game changer for aviation scanners," allowing pilots to see and hear multiple aircraft without switching frequencies or adjusting squelch levels.

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SCARP is also an awesome Arduino project. You can learn about RF technology, Arduino’s, and how to make things really small. You can create any screen interface or user control system that you desire. It works with 25khz spacing. It works with 8.33 kHz spacing. You can adjust the oscillator to compensate for off-center reception (if you’re smart enough to figure out how.)