Analog to Digital Transition FAQ

I have no distribution box, (here we go again), I hooked the converter to the exterior center jack on the power supply,(per instructions from Cust Serv Winnebago. I have the wingman installed. I can get 4 digital channels relatively near by, nice and clear, as long as I do not turn the amplifier on. Turn it on and the screen turns full snow. I also have the RCA F cables hooked to the converter. I am sure I am hooked up incorrectly, but I swear I have tried every conceivable process. Any one have any suggestions. I also use satellite TV remote dish, no problem with it at all. It would be a major undertaking to take the TV out to get to the back of it. Can anything be worked out with the power supply cabling? I am about to give it all up. PM's are welcome