Has anybody with the proper gear actually measured the HF sensitivity of the newer RTL-SDR v3 dongles, when operated in direct-sampling mode on the lower HF bands? The only real measurements I have seen were from 50MHz and up. I have read a lot of comments in different blogs and forums about how the sensitivity is not the best, but I have had no trouble setting the noise floor in mine with simple antennas, even antennas that have very low gain. And it's not just that I have a noisy neighborhood, because I hear plenty of DX on these little devices. It makes me wonder if the concerns about sensitivity are overstated? Has anybody done any real measurements?