As inventions go, radio is much like the folding chair, members. Although not the monolith of television or the primordial necessity of fire, wireless audio transmission over space is damn fine functional technology useful for a plethora of purposes. Communication over great expanses? Check. Entertainment for the masses? Check. Detecting and ranging? Check again. And yet for all its heterogeneous purpose and engineering spectacularity, everything you need to build a hollar box is available from your local Radio Shack. So this week, when vast purpose and versatility are required, make like radio guts and transmit. If upon taking an inventory, you find you’re short a transistor, not to worry. Sure as Tesla’s 272 patents, it ain’t no thing to obtain.