This new article by VE6EY gives encouragement to those plagued by electrical noise, showing how diversity tuning and the RSPduo make all the difference: http://play.fallows.ca/wp/radio/software-defined-radio/make-swl-great-again-with-rspduo/
In another recent article, John demonstrates spatial diversity using a a switched pair of orthogonal wideband loops near the ground: http://play.fallows.ca/wp/radio/software-defined-radio/dual-antenna-spatial-filtering-really-works/