gargoyle

Hello members. I have a avic d3 for a few years now installed in my 2000 ford expedition, a few weeks ago i started having problems with the gps signal, i reset the unit and the signal is all the way down so i told my self that the gps antenna may be bad, i went on ebay and bought a new antenna and am having the same low signal problem, does anyone have any info on this problem. thanks in advance for any help