Not sure if they are still carried, but I've used a Radio Shack 15-1853 tuneable loop for a few years. Even use it with my Boatanchor Hammarlund for AM DX. Great antenna. It rivals the internal loops of the GE Superadio and Sony 2010. -- Douglas B. Pritchett Merry Christmas from Fort Wayne, IN WBZQ1300 at verizon.net