Anyone here have any experience with SDR? I was thinking about getting one of these just as an elementary play / learning tool. http://www.amazon.com/Receiver-RTL2832U-Low-Cost-Compatible-Packages/dp/B015DN4DP6/ref=sr_1_8?s=electronics&ie=UTF8&qid=1451794726&sr=1-8& For $15 or less? Can't be...