If you are connecting the ground wire directly to the Base with pin #5, then it won't matter if you are plugged into surge protector strips. If your extra ground wire is connected to the house wiring ground after the surge protector, then the surge protector could be attenuating your signal. The best place to connect the ground "antenna" is pin #5 of the DB9 socket on the Legacy Base. You can buy the appropriate gender plug on Digikey, Mouser, or ebay. Maybe Radio Shack which seems to still be around mostly on line.
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