HEY GUYS, OK I HAVE ADDED A BLUETOOTH, XM TRAFFIC AND SIRUS ACC. THE BLUETOOTH AND THE SIRUS RADIO WORKS PERFECT, BUT MY XM'S SIGNAL SOMETIME WORKS AND SOMETIMES DOESN'T. i TRIED PUTTING THE ANTENNA OUTSIDE OF THE CAR AND THEN INSIDE WITH THE LITTLE METAL SHEET SUPPLIED BUT STILL NO GOOD. THERE IS TIME THAT I WILL HAVE A STRONG SIGNAL, THEN NONE AT ALL. IS THERE A "PROPER WAY" THAT I NEED TO INSTALL IT?