Wirelessly posted (BlackBerry8530/5.0.0.973 Profile/MIDP-2.1 Configuration/CLDC-1.1 VendorID/105)
You could also check the center pin contacts, on the BNC. GRE uses inferior female BNC connectors on their products, which tend to lose contact with the center pin, as they lose springiness. (If this is the problem, a temporary fix is to use a small tool, and gently flex the contacts back towards the center.)