I have now had two of the Terk XM-5 marine XM radio antennas die on me for no apparent reason. It gives the dreaded "No Signal" message on the Sky-Fi receiver. It knows the antenna is connected, because when the plug is removed it gives a "No Antenna" message.Has anybody else had bad experiences with this antenna? Any other suggestions. I find the standard antenna is too directional when underway, with frequent dropouts.It's not the antenna as much as the time and effort it takes to install/replace it...Derek