Indoor tv antennas without the unsightly rabbit ears ?

I saw them advertised on one of those door to door gadgets and knick knack catalogues but can't find it anymore for the life of me. It looked pretty nifty as it didn't have those clumsy rabbit ears or anything like that. Although i'm not quite sure what it was made of exactly it looked like a small rectangular slab of ceramic not much bigger than a postcard. All you had to do was place it on top of your tv and plug it into your tv and presto perfect tv reception with the clutter! Does anyone know where i can find something like this ?