Here's the rig I'm talking about. Will pull out NDBs $3000 receivers won't hear. Mine has selectable filters for 3.1KHz and 45Hz This guy's asking price is just stupid, of course. But if you see one of these at a hamfest cheap and you have any interest in Longwave, grab it. I have the service manual. http://www.ebay.com/itm/221984361712