My antenna booster did not work from the factory. I corrected the problem by replacing the
electrical splices on the 12v line and all is well. The issue with the factory crimp is one pair of the wires being spliced is too small for the splice splines to cut through the insulation and make the connection.
Sounds this may not apply to your issue but it's a fairly common problem with the method that
Scamp uses to make their connections to the amplifier.