I noticed that my various mil-air scanners suddenly went quite on me,ran some tests and discovered that my Stridsberg active multi-coulper was not working. I called STRIDSBERG and the tech I spoke with told me to ship it back to their labs and they would check it out and repair and upgrade if needed. Two weeks later I received my multi-coupler that they had to replace an MMIC and upgrade to a later ver. Its really nice to deal with an AMERICAN manufacturer that stands by its great product and warranty.