It would also may help to know the model. We had a tech insert an Antronix MRA2-11 at the ingress, only for cable, and when he put it in he stated you "must never put it in series with a modem". That doesn't agree with the specs, but given that it is specified as +11.5 db nominal gain and my signal is already at about +14 (until I padded it down as an experiment) I suspect it was good guidance. Since I no longer use Cox Cable, the downfeed from the antenna in the attic now goes to it, and then it goes to the legacy cable feeds in the house.
