Added on January 22 2010

Select-a-tenna tunable AM loop

No connection to the radio, and no power or batteries are used with this antenna. You place it close to the radio, finding the best spot, and tune both the radio and antenna to the same AM radio frequency. It really boosts reception on all but the best radios, and reduces back ground noise too. It's about 11 inches in diameter and 2.5 inches thick.