I had a 396XT connected to an external antenna that stopped receiving. Originally I figured the cable went bad, I took out my 346Xt and hooked it up to the external antenna and it worked just fine. About 4 days later it stoped receiving. I put the rubber duck antennas on them and tuned to the local weather frequency, which I should get with no problem, and both scanners are completely silent. Will not receive anything. The 396 has been working fine on the external antenna for about a year. Any thoughts on what could of happened?