The T1 external antenna will boost indoor reception on portable FM, shortwave and NOAA weather band radios that have a telescopic antenna or 3.5 mm antenna port. The compact design with retractable 23 ft cable will allow you to attach the antenna up high near a window. The T-1 extends to a full 23 feet and enhances the performance and reception of your shortwave radio beyond that of a typical built-in telescoping antenna. An adapter plug is provided for those receivers lacking a standard 1/8-inch (3.5mm) mini plug, which attaches directly to the telescopic antenna. Installation is easy, just hang the compact unit up high in the room by the hang loop, and leave some slack wire to connect the antenna to your radio.