The HackRF looks really cool, but I'm more excited about the next gen one they are working on. No idea if that will be years from now or what, but full duplex

The HackRF looks really cool, but I'm more excited about the next gen one they are working on. No idea if that will be years from now or what, but full duplex is really cool, maybe we can start doing more with EPC Gen2 tags, assuming they are still relevant for DIYers by then and we don't have battery free Bluetooth instead. I have one of the cheap SDR tv dongles, you can hear a lot of interesting stuff on those.