check the model number of the plate... depending on which wineguard (eg. rv 7542) may have been wired incorrectly.... but more likely that you are not using it correctly. You may only have to move the connection that say "tv". NOTE: on the model stated, the switch is for "on /off" of the built in amp.
IF said plate is wired correctly, you need to take the satellite feed for the receiver off from the top coax connector (marked aux/sat). This feed bypasses the "electronics" in the plate and feeds the incoming signal from your "previously stated" outside coax connection which should be connected to your dish / LNB. IF you are using an antenna to your TV, you then need to take the coax feed mark TV to your TV set and select the switch "on" to cause the amp to work with your ceiling antenna. Further, if you are using CATV instead on the outside input. Again, you use the coax marked TV to your tv BUT you set the switch OFF to NOT use the amplifier.
I use a similar setup for my sat setup using an older wineguard but the operation is the same.