Tune Trapper Hidden Marine Boat AM FM Stereo Radio Antenna Designed to be HIDDEN - Conceal in hull or any compartment in any position. Requires No Ground - No Power - No Amplifier - Just Plug It Into Radio Hand Tuned to the FM Band 87.5-108 MHz for Excellent Reception. Quality MADE in the USA - Water Resistant - Each Antenna Individually Tested GUARANTEED PERFORMANCE.