I heard lots of amateur radio operators talking about "waterfalls" I must admit I had never heard of one before so when I saw one for sale in the shop I thought I would take a chance and buy one and very glad I did what a great piece of kit. I used it in conjunction with the default band scope one on top of the other to get a comparison between the two. the waterfall showed very weak stations that did not show up on the default band scope. very good for long distance dx work. would recommend this band scope.