Might a corroded antenna connection(s). VHF radios are really tough, and most of those on sail boats are not exposed to the elements like those aboard power boats. Consequently, they seem to last forever. Use a multimeter and check the connections before shelling out the money for a new one. I though mine dropped dead while at the rendezvous, stopped at west marine and picked up a new one today. While removing the old one the radio suddenly came to life. Turned out to be a corroded crimp connection on the negative power line. I removed both crimps, soldered and heat shrinked the connections, and my 15-year-old VHF still works like a champ.