You can usually barrel connect a sat signal a few times without signal degradation(ie: multiswitch to patch panel to wall plate to reciever). I would bet it is your f connectors that twist on. If you plan on messing with coax a lot invest in a crimper and use crimp on ends. They never have the problem of the shield touching the core which is my guess. as for putting an amplifier inline with sat signal, that is a no no because the signal is running at anywhere from 13-18 volts and if you amplify that you will burn out your receiver, multiswitch, or LNB on the dish.