Yeah,
I been doing more research. Many people are observing better performance with shielding. Apparently, the RF front end is not shielded enough, and the USB port is not decoupled enough. I am not sure what the people at SDRPlay were thinking when they utilized plastic shielding. I think its a shame that SDRPlay put a lot of effort into a product, but ruined it by cutting corners. Also, be warned of the many favorable reviews of this product. All the reviews I read did not mention the serious erroneous tones produced. In other words, this receiver is so good that it receives signals that don't exist. Therefore, I put this device in the toy category.